# experiment 8

Spectrophotometry Use in AnalysisPart 1: Calibration Curve Data:
6oi.i , )0
6\°’ .1o )1)’)’\
1
Sta e
, °I ,”.to ;.t-i–.,….J
Wavelength (nm)
~~
Absorbance
Concentration (M)
(see calculation #2)
Part 2: Hydrate Data:
Mass of Solid used ‘c> , ~
3 ). ~ J
6o q, %0 V’ VV\
Absorbance of Solution O , 4′!, /,. )
Wavelength (nm)
2
3
4

·I
II ,1
I I
I

!’ l ‘ ;I

1’
A
I
n
‘t’
Stage 3
Stage 4
(r.,’1(:H .o …L)
A:. c.. b S•Y h …. …. c. -c. C….. ; +- ,., s, )
(.11:, .0 … L)
~.::
– Co”‘,c.”~r”‘½- , o,,_~
M c.. ().)D~\ ·. ( … (W>\. –
0,.,’ ,. . . \ C..-.. sol·”
M C…
….
– – ;1- C…ll’-‘D.\
-_ _ _ ._ I, _L
__ V
I L.
1000..,L
40.0 “‘L. _
«o.o -.L
tv\, c. ..
)C.
:lo .o .._L =-
~S,£>0 … L
s +-. 1′- J :
M G….
(Jv\ )
e, 0 ,,_~ H\\.oi
( M- 1 o r
~ )
=
X
0
K =.
c.\.,.~~) .. »-io;l,~ l
(. D >\ L
It’
5 L.(1,lO,). -.
M C.,.
.,.I C.. (ND,\ \ I
I 1\.0
1. Calculate the concentration of the stock solution in mol/L.
2. Using the dilution formula, C1 V1 = C2 V2 , calculate the concentration of copper(II) ion in each of the
four different stage solutions:
a. Stage 1
b. Stage 2
c. Stage 3
d. Stage 4
r
3. Graph absorbance a
f
.
websites
s a unction of concentration of copper(II) ion on the Chemistry Lab Resources
0
you can get the slope and y intercept.
a. Does th is plot appear to be a straight line?
Yes No
b. Does the data appear to lie along a straight line that extends back close to (0,0)?
c. According to your results, is Beer’s law valid for this case?
4. From the best-fit line of your data:
Slope (2 decimals)
Yes No
Yes No
=
Y-intercept (2 decimals) =
5. Graph the data on paper and include the best-fit line. Include your graph with your report.
6. Using the slope and y-intercept of your best-fit line, the absorbance of your hydrate, along with
y = mx + b, determine the concentration of copper(II) ion in your dilute unknown hydrate solution.
This was the solution that was in the cuvette. Hint solve for “x” and keep three significant figures.
7. Calculate the concentration of the original copper(!!) ion solution in the volumetric flask. Hint solve
for C1 when using the dilution formula, C1 V1 = C:N2. C2 is the copper(II) ion concentration calculated
in the previous step.
8. Now you need to calculate the concentration of copper(II) nitrate in the volumetric flask and you need
to calculate it using the concentration of copper(II) ion. Use the concentration from the previous step
and the mole ratio between copper(II) ion and copper(II) nitrate. Hint First write out the chemical
formula for copper(II) nitrate and then do a stoichiometry conversion.
9. Calculate the moles of copper(II) nitrate present in the volumetric flask.
10. Calculate the mass of copper(II) nitrate in the 100.00 ml volumetric flask.
11. Now that you have the mass of copper(II) nitrate, subtract it from the mass of hydrate you originally
weighed to get the mass of water in your hydrate.
12. Calculate the amount of water in your hydrate in moles.
13. Divide the moles of water (from #12) by the moles of copper(II) nitrate (from #9). This is your
experimental value for the number of waters of hydration.
14. Go to the Chemistry Lab Resources website, CHEM 1090 Labs/Experiment 8, enter your data,
and record the results for the number of waters of hydration attached to the copper(II) nitrate
formula unit (#13). Compare it to your calculated value in #13 above. If they are significantly
different then you need to fix any mistakes:
15. Take your value calculated in #13 and round it to the nearest whole number.
16. Write the chemical formula of your hydrate using the rounded whole number from #15.
CC”‘- C,J13J’i, . . . .. 1-h 0~
computer and access the folder named either “ES-CHEM”, “LN-CHEM”, or “WB-CHEM” in the
“Z” drive. Or, you can find the file linked in the instructions page for this experiment module in your
Canvas shell. Open the pdf file, “Physical Constants of Inorganic Compounds.” Find the metal
name section of your compound. Under the metal look for the anion by name. Examine these
hydrates and write down the chemical formula closest to your own.
sec
18. Using your unrounded value calculated in #13 as the EV and the value from the chemical formula
you just looked up in #17 as the SV, calculate the percent error.
I

Don't use plagiarized sources. Get Your Custom Essay on
experiment 8
Just from \$13/Page
Calculate the 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
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.
Other
Great Writer. One of the best they have.
Customer 454983, March 7th, 2022
Other
Thank you for the quick response
Customer 454677, April 21st, 2021
Art (Fine arts, Performing arts)
Thank u
Customer 454677, April 17th, 2021
english
I would highly recommend this service to anyone struggling with writing. I am good with numbers but not writing. I actually used two services to see which was better. I copy and pasted both instructions the exact same way with customscholars and the other with studybay. Study bay did not follow any of the instructions and even used a different article than I provided not only that study bay i asked for a revised paper due to it not being anything according to my instructions and it is not due for another day which I need it before they can revise it. Customscholars delivered ON time, quicker more efficiently AND even revised a couple things I noticed I wanted to add into the essay. This is my first time using a service like this and I will not go anywhere else!
Customer 455199, December 11th, 2021
Psychology
Greater than anticipated. Thanks for the start.
Customer 454569, November 8th, 2020
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
Other
Great writer
Customer 454983, March 14th, 2022
Technology
Thank you
Customer 454677, April 27th, 2021
Criminal Justice
great paper. came fast and exactly what I needed
Customer 455099, November 13th, 2021
Criminal Justice
THANK YOU so much I am very pleased with this paper.
Customer 454561, November 1st, 2020
Other
Part 1 was supposed to be at least 300 words and it wasn't. If the writer needed more pages I would have paid.
Customer 455319, October 27th, 2022
Nursing
thank you!!
Customer 454959, February 4th, 2022
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend