write 2 prelabs &2 post labs organic chemistry

Refractive index: 1.4644Optical rotation: 10.5°
Mass of the orange rind: 10g
Mass of the D-limonene: 0.2g
TLC plate 1:
Distance travel by solvent: 5.3cm
Compound
Acetaminophen
Aspirin
Ibuprofen
Distance travel by compound
3.35cm
4.00cm
4.80cm
TLC plate 2:
Distance travel by solvent: 5.2cm
Compound
Aspirin
Caffeine
Unknown
Distance travel by compound
4.10cm
1.7cm
4.10cm
TLC plate 3:
Distance travel by solvent: 4.5cm
Compound
Isolated β carotene
Standard β carotene
Final mass of the β carotene:0.2g.
Distance traveled by compound
1.3cm
1.3cm
TLC plate 4:
Distance travel by solvent:3.2cm
Compound
Isolated β carotene
Distance traveled by compound
0.9cm
TLC plate 3:
Distance travel by solvent: 4.5cm
Compound
Standard β-caroteen
Isolated β-caroteen
Volume of the isolated β-caroteen:11mL
Distance travel by compound
1.3 cm
1.3 cm
Hi, everyone. Today we’re going to do experiment five, the liquid CO2 extraction of D-Limonene
from the orange rind. So CO2 is really easy to be liquefied, after it reaches the critical point, and then
we increase the pressure so it can be liquefied. For today’s experiment, we’re going to use the hot
water, so I’ve prepared the hot water bath here. So the first step, we can go ahead and prepare the
tube. So, we’re going to use a centrifuge tube, which is a 50 milliliter centrifuge tube. And then we’re
going to use a copper ring. And then, you put the filter paper on top of the copper ring and then put
them into the centrifuge tube. I just prepared one. It’s not that good-looking. But as long as you put
the filter paper on top of copper ring, so it can prevent the orange rind from falling to the bottom. So
now, we can go ahead and use the cheese grater to get the orange rind. Remember, only get the
orange part, not the white part. And we need about eight to ten grams. So now, I’ve got the orange
rind and I’m going to pack it into the centrifuge tube. So when you pack it, remember to pack it
loosely, so the liquefied CO2 has space. So now, I’ve packed the orange rind inside loosely. So
remember you can’t get the orange rind to the bottom. So now, I’m going to mash some dry ice and
put it inside. So before you put the solid CO2 inside the tube, you have to make sure the
temperature of the water is not that high. So now, it’s a little bit higher than 60 Celsius. So, we can
go ahead and prepare the dry ice. Grab some dry ice, and then you have to break it into pieces. And
then we just put the dry ice inside the centrifuge tube. You have to add the seal to the top of the
tube. And then you close it. So now, we’re going to transfer the hot water to the plastic graduated
cylinder. And then we’ll put the tube inside the hot water, and then we’ll close the sash. Just observe
from the outside. So now, you can see the liquefied CO2 just pass the orange rind. And you can see
some small bubbles inside, and that’s our liquefied CO2. And I’m not sure if you can hear the
noise. But from here, you can see some small bubbles gathering at the bottom of the centrifuge
tube. So when you do this experiment, make sure you pack the orange rind really loose and add a
little bit more dry ice. Remember to add the dry ice to the top of the centrifuge tube. You may hear
the noise. And at the bottom, you can see the liquefied CO2. And remember, when you do this
experiment, always use the plastic graduated cylinder. Try to avoid all glassware in this
experiment, because the pressure will build inside the centrifuge tube. And now you may see some
orange oil at the end of the centrifuge tube. It’s not that clear. But after we take it out from the
water, you can see it clearly. So now you can see, there’s a drop of water outside. And at the bottom
of the centrifuge tube, that’s the D-Limonene we extracted from the orange rind. So after we
extracted the D-Limonene from the orange rind, I’ve already recorded the mass of the empty
centrifuge tube. And then I’ll take the orange rind out and then measure the test tube again, so you
can know the mass of the final product. And the result will be provided. Please use the result to
finish your post-lab report to calculate the percent yield. So now let’s move to the polarimetry and the
refractive index. So first, let’s go ahead and measure the polarimetry. To measure the polarimetry,
we need about one gram of the D-Limonene. So we don’t have enough D-Limonene, so I borrowed a
little bit from the stock room. And I just measured one gram off the D-Limonene. So now I’m going to
add 10 milliliters of the ethanol. You may notice that I didn’t use the graduated cylinder. Because you
can see here there is a line which is the mark of 10 milliliters. So you just need to add to the
line. And after you add 10 milliliters of the ethanol, you have to mix it well. So now, we just finished
the preparation of the sample for the polarimetry. And this is the tube inside the polarimeter. I will
show you the polarimeter in a second. So now I’m going to transfer the liquid into the tube. So the
first step is, open the cap. Be very careful, because there is a small piece of glass inside it. And now,
we’ll just use a pipette and then transfer the liquid inside. And then cap it. So for this step, you have
to make sure there’s no bubbles inside. To check if there’s any bubbles, you can flip it. If there’s no
bubble inside, which means you’re good to put it inside the polarimeter. So now, let’s have a look at
the polarimeter. So this one is the polarimeter. So here is the sodium vapor lamp. And here is the
sample cell. I will just put the tube inside. And then we close it. And here’s the eyepiece. You can
see from here. And for here, there is a outer scale. It’s a whole number. And here’s the inner
scale. It’s a decimal. When you read the number, you have to read the whole number first, and
then read the decimal point. So when a plane polarized light enters a sample cell, which contains
your chiral product, the light will be rotated either clockwise or counterclockwise. So at the very
beginning, you should see the right-side a little bit darker, and then we rotate it. So when you rotate
it, you can see a reverse image. So now, you have to find the point in the middle, so make sure the
two sides are at an equal brightness. So now, it’s like equal brightness, and then we read the
number. So, from the outer scale, it’s 10, and for the decimal, it’s 0.5. So, for the rotation angle, it’s
10.5. And then you have to finish the whole calculation according to the lab manual. So you have to
calculate the percent E.E. with the rotation angle. And remember, we used one gram of the DLimonene and we added 10 milliliters of the ethanol. So make sure you get the right
concentration. And then you also get the alpha value, alpha pure, from the lab lecture. Please
calculate the percent E.E. according to your lab manual. So now, we’re going to read the refractive
index. So refractive index is a physical constant. It’s the velocity of the light in the air to the
velocity of the light in the liquid. So this is the refractometer. It’s really easy to use. This is the DLimonene we just extracted. And we’re going to use the pipette to get a little bit, and put two or three
drops on the– you can’t see here, but there’s a sample cell. And, after you put it on the measuring
prism– this part is called the measuring prism. It’s at the back. You have to put your few drops of the
sample, like two to three drops, and then you just close it. So after that, we have to turn the index
knob. There is a X inside, which you will see from the eyepiece. So you have to make sure the line
separates the light part, and the dark part is at the cross. So now I’m going to adjust. It’s really easy
to see the X inside. And the top-side is light, and the bottom side is dark. After you get the line to the
cross, it’s really easy. You could just click read. And now it’s reading, please wait. And now we’ve got
the number. It’s 1.4699. And this is the refractive index we got. Please also use this number to finish
the calculation, fill in your lab manual. So that’s all for today’s experiment. You have to compare this
method with the previous liquid extraction method, and also analyze the polarimetry, and also the
refractive index. So find some advantages of this experiment.
Hi, everyone. Today, we are going to do experiment three. So experiment three contains two
parts. For part a, we’re going to analyze four different analgesics with the TLC plates. And for the
second part, we’re going to isolate the beta carotene from the spinach, and then we will do analyze
with the TLC. So chromatography is the technique we often use in organic chemistry. In organic
chemistry, you are going to learn GC, TLC, and column chromatography, which is the CC. So, for
today’s experiment, we’re going to learn TLC and CC. So for experiment nine, you are going to learn
GC. So for part a of the experiment, first, we’re going to analyze four different analgesics, which is
acetaminophen, aspirin, caffeine, and ibuprofen by the TLC plates. And then we’re going to use one
unknown. We’re going to apply the unknown on the TLC plates, and you have to identify what is the
unknown based on its Rf value. So first, you can have a look at the TLC plates. So you can see it
has two sides. One side is smooth and one side is a little bit rough. We’re going to use the rough
side, because this side contains the silica gel. So the first step is we have to draw a baseline. So the
baseline is about 1cm from the bottom. So we’re going to draw a baseline. So you can see here, you
have to draw a baseline with your pencil slightly. And then the second step– you are going to use
your pencil to draw three small spots. So now you can see three different spots on the baseline. So
the purpose for this step is, you have to know where should you apply your compounds. And
according to a lab manual, we should have four compounds on each TLC plate. But here, I will only
apply three to make sure they are separate enough and won’t mix with each other. After you are
familiar with the TLC plates, you can go ahead and apply four compounds on each plate. All
right. So after we have the pencil spots on our baseline, we can go ahead and apply the
compound. So we apply our compounds. You have to use the capillary tube. You will also use the
capillary tube when you test the melting point. So here’s the capillary tube. And the liquid will rise up
inside the tube based on the capillary action. So for the first TLC plate, the first spot will be
acetaminophen, and the second spot will be aspirin, and the third spot will be ibuprofen. So
remember, for the ibuprofen, because it’s not that UV active so you have to spot it for a few more
times. So now, I’m going to apply the first compound. So here is the acetaminophen. You just put
your capillary tube inside. And for this step, one drop is enough. Now, you can see the liquid inside
the tube. And then we just put it– apply the compound on our first spot. And then remove your tube
quickly. So now, you can see a spot on your small pencil spot. So now, we’ve finished the
preparation for the acetaminophen. And now, we’re going to apply the aspirin. Remember, after you
use each chemical, remember to cap it. Now, we are going to apply the aspirin spot. And the last
one is the ibuprofen. So remember, for this one, you have to apply it for a few more times. So here’s
the first time and wait until it’s dry. And after it’s dry, you apply it again. And now, I’m going to apply it
for the third time. So after you finish the preparation of the TLC plates, before I put it in the chamber,
you have to check it under the UV light. So now, you can check the TLC plate under the UV light. So
you have to make sure each spot are separate enough, so they won’t mix with each other. And after
a check of your TLC plate, now, we can go ahead and prepare the mobile phase. Now, we’re going
to prepare the mobile phase, so we’re going to prepare the 95% ethyl acetate, and 5% acetic
acid. So the total volume is about 5 milliliter. So I’m going to use 4.75 ethyl acetate, and 0.25
milliliter of acetic acid. So we are going to use the graduated cylinder. If you are going to measure a
large amount of the liquid, you can use a funnel and put it on top of the graduated cylinder and
transfer the liquid. But 4.75 is a small amount, so we’re going to use the pipette. And now, I’m going
to add 0.25 milliliter of the acetic acid. And now, I’m going to transfer it into the chamber. Make sure
they mix well. So after I finish the preparation of the mobile phase, you have to put the TLC plate
vertically inside. And when you do this step, remember to put the cap on, because if you open the
cap the solvent may evaporate and the ratio may change. So now, we open it slightly and use the
tweezer to put the TLC plate inside vertically. And then you also put the cap on. So when you do this
step, you have to make sure the solvent is lower than your baseline. And now, you can see the liquid
is moving to the top. So when it’s, like, 0.5 centimeter from the top edge, you can remove it from the
chamber and bring it under the UV light again. And then you can know the Rf value. So now, I’m
going to remove the TLC plates from the chamber. So after you remove the plates from the
chamber, you have to draw a front line. So the front line is where the solvent stops. And then we can
go ahead and check under the UV light. So this is our first TLC plate. Here is the baseline and here
is the front line. So now you can see three different spots. You’re going to use your pencil to circle
it. And here is the second, and here is the third. So after you remove it from the UV light, you can still
see your spots. So this is the first TLC plates. And let’s have a look at the second one. So for the
second TLC plates, the first one is the aspirin. You can see A here. And the second spot is the
caffeine. You can see C here. And the third spot is the unknown. So now, let’s go ahead and check
under the UV light. So now, you can see three different spots. Again, we’re going to use our pencil to
circle the spots. Then, remove from the UV light. Now you can see your spots. So now you have to
measure the distance. If you want to use the center of the circle, you have to be consistent. Use the
center of the circle for each compound. If you want to use the bottom, you can go ahead and use the
bottom for each one. So now, I’m going to measure the distance between the baseline and the front
line, and the center of the circle to the baseline. So here’s the results for two TLC plates. So this is
the second TLC plates, and I prepared during I was waiting for the first TLC plates. The procedure is
exactly the same. You just need to draw a baseline and draw three pencil spots and then apply your
compounds on it. So now let’s have a look at the result for the first TLC plates. As you can see, the
first one is the acetaminophen, the second one is the aspirin, and the third one is the ibuprofen. So
when you calculate the Rf value, you have to use A divided by B. And A is how far you compound
travels, and B is how far your solvent travels. So for the B value, you can see here is the front
line and here is the baseline. And the distance is 5.3 centimeter. And for acetaminophen, so I
measured the distance from the center of the spot to the baseline, and it’s 3.35 centimeter. And this
is the A value for the acetaminophen. This is how far acetaminophen travels. And for aspirin, it’s 4.0
centimeter. And for the ibuprofen it’s 4.8 centimeter. So now let’s have a look at the second TLC
plates. So for the second TLC plates, it’s just a different compound. So for the first spot, it’s the
aspirin. It’s the same with the previous one, but for the second one is the caffeine, and the third is
unknown. So here is the front line. Here is how far the solvent travels, and here is the baseline. So
you can see the distance between the front line and the baseline is 5.2 centimeter. And so for the
first spot, the aspirin, the distance between the middle of the spot to the baseline is 4.1
centimeter. And for the caffeine is 1.7 centimeter, and for the unknown it’s 4.1 centimeter. So you
have to use this result to identify what is the unknown. And please explain why you give this
conclusion. And also you have to discuss two different TLC plates. So now let’s move to part B. Part
B– so for our very first beginning, we’re going to extract the beta carotene, isolate the beta carotene
from the spinach. So here, this is 2 gram of the spinach, and we’re going to add 15 milliliter of the
acid on. Here’s 10 milliliter, and I’m going to add 5 milliliter more. So now, we’re going to mash the
spinach for 10 to 15 minutes. I’ve been mashing the spinach for 15 minutes. And now, we’re going to
decant the liquid to another Erlenmeyer flask. So now, we’ve transferred the liquid to another
flask. And now, we’re going to add anhydrous sodium sulfate. So the purpose for this step is we are
going to dry the liquid. Drying means absorb the water inside the liquid. And we are going to use the
spatula and add a little bit of sodium sulfate. So as you can see, I prepared the hot water
bath, because now, we’re going to transfer the liquid to another vacuum flask, and then do the
vacuum evaporation. So for this step, we can use the hot water bath to make it evaporate
quicker. And now, we decant the liquid. So here’s the setup for the vacuum evaporation. It’s really
similar to the vacuum filtration. The difference is we are going to use the vacuum flask. And now,
we’ll connect it to the vacuum flask, and put the vacuum flask on top of the steam bath. And now, we
start the vacuum. So now, you can see some small bubbles inside the vacuum flask, which
means the vacuum pump is working. So now we have to wait like 10 to 15 minutes to make sure it’s
dry. And you will see the green residue inside the vacuum flask. So now it’s almost dry in the
vacuum flask. We can go ahead and prepare our micro column. So here is the column. And you
have a cap on top of it, and you also have a cap at the bottom. So after we remove the caps, we
have to fill the column with the silica gel, like, half way up the column. And then we just slightly tap
the column to pack the silica gel. And you can use a small clamp to hold it. After we add the silica
gel inside, we have to add a little bit of sand, it’s about 0.5 centimeter. So now, you’ve finished the
preparation of the micro column. You can see here’s the silica gel, the white part, and the brown part
is the sand. And then you use a small clamp to hold it. So now you can see the ethanol inside the
vacuum flask is almost dry. So now, we turn it off and stop the heating, and then remove the vacuum
flask. So now, you can see the green residue inside the vacuum flask. And now, we’re going to
dissolve it with 1 to 1 ethyl acetate and petroleum ether mixture. You may need a little bit more than
five to six drops. But if you add the mixture now, it may evaporate really fast. So before I add it to the
green residue, I prefer to wet the column first. So before we run the column, we have to wet the
column to make sure there is no air inside the silica gel. So now, we are going to add a little bit of
petroleum ether to wash– to wet the column. So now, you may understand why we add a little
bit sand on top of it– because we don’t want that, after we add the solution inside, it disturb the
column. So we put a little bit of sand on top of it. It’s like to protect the silica column. So now, you
can see the petroleum ether flows to the bottom. If you want to speed it up, we can use a small
bowl. So when you do this step, you have to use one of your hands to hold the column, and put the
bowl on top of it. And then you squeeze the bowl. You can see it’s moving faster. And remember,
now, you have to remove the bowl and then release the pressure. If you release the pressure when
you put the bowl on top of the column, the whole column will be sucked into the bowl, and you have
to prepare that column again and clean the bowl. So now, you can see the liquid is flowing to the
bottom. Give it a little bit more pressure. To make sure that the whole column is wet. And now, I’m
going to add the 1 to 1 mixture to the green residue. All right, so here is the petroleum ether, and
here is the ethyl acetate. Now, I’m going to add six drops of the petroleum ether and six drops of the
ethyl acetate. And you can see, it’s still a little bit hard to dissolve all the green residue. So now, you
can add a little bit more 1 to 1 mixture. So after we use the 1 to 1 mixture to dissolve the green
residue, remember, we have to save a little bit for the following TLC plates. And for the rest, we can
add it to our micro column. I’m going to save one drop for the TLC plates. So now, after we add the
green residue to the column– now, you can see at the bottom, there is a little bit yellow part, and
that’s the beta carotene we want. I’ve got six test tubes, from one to six, and we’re going to collect
the liquid inside the test tubes. So remember, we are only going to collect the yellow part, which is
the beta carotene, because it’s really difficult to collect other colors, and you will see when we run
the column. So now, I’m going to put it lower to make sure we can collect the liquid. So now, we’re
going to run the column with the pure petroleum ether. After you add the petroleum ether inside, put
the bowl on top of it, and then squeeze it. So now, you should see the yellow part here. So this is the
beta carotene we want to collect. And when it moves to the bottom, we are going to change to
another test tube. So now I’m going to add a little bit more petroleum ether. And also, give it a little
bit of pressure. And now, you can see the yellow part is really close to the bottom. So I’m going to
change to the second test tube. And now, we’re going to add a little bit more petroleum ether to
collect all the yellow part. So now, you can see there’s no yellow part at the bottom of the column,
but the green part is still at the top. So in case the beta carotene is stuck here, I’m going to wash a
little bit more. So here is the second test tube. And now, you can see it’s a little bit yellow
compared with the first test tube. And this is the beta carotene we just collected. Now, I’m going to
do the vacuum evaporation again, because this one is very diluted. If you run the TLC plate with this
beta carotene, you may– it’s really difficult to see the spots. So I’m going to do the vacuum
evaporation now. So now I’m going to transfer the liquid inside the second test tube to another
vacuum flask. And also, put the rubber stopper on top of it and then start the vacuum pump. Also, if
you want to make it dry faster, you can also use the steam bath. So now, you can see the liquid
inside the vacuum flask is almost dry. So now, we stop the heating and then remove the vacuum
flask from the steam bath, and then close the vacuum pump, and then remove it. So because the
color is yellow, it’s really difficult to see. So hopefully, you can see that tiny yellow color at the bottom
of the flask. All right, so now, we’re going to do the last step of today’s experiment. So we’re going to
run a TLC plate with our crude, the green residue we saved previously. And then the second one is
the standard beta carotene we got from the stockroom. And the third is the beta carotene we just
isolated. It’s exactly the same steps. You have to draw a baseline like 1cm from the bottom, and then
you draw three spots, and then you apply all your compounds on the spots. I’m going to use a
capillary tube. So this is the green residue we just saved, and I’m going to use three drops of
hexane, and then apply the green residue to our TLC plate. And for the standard beta carotene, I
already it to the TLC plate when I was waiting for the vacuum evaporation. So now, I’m going to spot
the beta carotene we just isolated. Also, we’re going to dissolve the residue with a few drops of
hexane. It evaporates really fast, so make sure you do this step as quick as possible. So now,
maybe you can see more clearly the yellow color. Also, don’t forget to check under a UV light before
you put it in the chamber. So this is the TLC plate under the UV light. The first spot, it’s a little bit
hard to see. This one is the crude, and the one in the middle is the standard beta carotene. And the
third spot is the beta carotene we just isolated. So now, we’re going to put it in the
chamber. Remember, this time, we have to change the mobile phase to pure hexane. Last time, we
used 95% ethyl acetate and 5% acetic acid. But now, you have to change the mobile phase to
hexane. So this is the TLC plate we just finished. And the second spot is the standard beta
carotene. You can see a bright orange spot here. And the last one is the isolated beta carotene. And
you can also see and orange spot here. But for the crude, I didn’t see the spots clearly, so I ran it
again. So now, you can see I only have one spot on top of it, which is the crude, the green
residue. And then you can see here is a small orange spot, which is the beta carotene. And further
up for the rest part, it’s still at the baseline, which means it may be more polar. And now, we’re going
to put them into the iodine chamber. So we didn’t use the iodine chamber for the first part, because
all of the four compounds are UV-visible. So we can just check under the UV light. But if you have
the compound which is not UV active, you can use the iodine chamber to colorize it, to make it
visualize. So now, we’re going to put them into the iodine chamber. I’m going to put the plates inside,
and then cap it. So now, I just removed the two TLC plates from the iodine chamber. And now you
can see the spots are really clear. And I will measure the distance for you to calculate the Rf
value. The result will be provided, and please use the result provided to finish your post-lab
report. And that’s all for experiment three.
Pre-Lab Format (20 points for each lab)
Pre-Lab # (Experiment #):_____________
Section
Points
Possible
Name, Section#, TA’s Name
2
Title of Experiment (directly taken from the lab manual)
2
Aim of Experiment / Objective
(A paragraph with a couple of sentences to explain expectation of the
experiment)
Chemicals Used
(List all of the major chemicals used. Include chemicals drawn in
organic style and include basic data about the chemicals such as
formula, molar mass, m.p., b.p. correct IUPAC name etc.)
Toxicity/Hazards
(Complete detailed list of toxicity/hazards of these chemicals)
Glassware/Equipment
(List all the glassware and equipment that will be used in the
experiment)
Experimental Setup / Design
(Properly describe/draw the set-up of experimental equipment,
example: drawing of simple and fractional distillation setup for exp.
1, extraction scheme in exp. 2 etc.)
*Reactions and/or Proper Chemical Structures
(Basic reaction scheme which shows a simple drawing using organic
style showing A + B → C + D) – No mechanism here!!
Procedure – Flow Chart (as usually described in lab lectures)
(A flow chart of the procedure must be included. Make sure it is easy
to follow and understand and do NOT direct copy from the lab
manual)
Points
Received
2
2
2
2
2
2
2
Overall Organization
(Is it legible? Neat? Easy to understand?
2
Total Points on Pre-lab
20
*When the experiment does not call for reactions, the points will be awarded for proper
chemical structures (i.e. correct organic style structures).

Don't use plagiarized sources. Get Your Custom Essay on
write 2 prelabs &2 post labs organic chemistry
Just from $13/Page
Order Essay
Calculate the price
Make an order in advance and get the best price
Pages (550 words)
$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Upload your instructions
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with Writall
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Nursing
Wonderful service. I plan to use this service again and recommend to friends and co-workers. thank you so much.
Customer 455459, September 30th, 2022
Other
Best writer ever
Customer 454983, February 21st, 2022
Philosophy
i like the customer services and the revision was on time. This is my third time using this website. i would recommend them. Just specify what you want and you will get an A in your paper.
Customer 454429, June 16th, 2020
Social Work and Human Services
thanks a bunch
Customer 453933, December 1st, 2020
Social Work and Human Services
,
Customer 453933, October 27th, 2020
Psychology
Thanks
Customer 453933, January 13th, 2021
Management
Got an A in this project.
Customer 453877, September 5th, 2020
Psychology
I just finished reading this work good strong start and conclusion too. In addition follows APA guidelines. Thanks.
Customer 453877, April 18th, 2020
Education
Awesome job!! Thank you!
Customer 455113, July 8th, 2022
Computer science
Great Job!!
Customer 455111, November 15th, 2021
Statistics
Excellent I got and A after the review. Thanks
Customer 453877, May 19th, 2020
Other
Great writer
Customer 454983, February 19th, 2022
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend
OUR GIFT TO YOU
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat
Live Chat+1(978) 822-0999EmailWhatsApp

Order your essay today and save 20% with the discount code GOLDEN