Chemical reaction lab

AgNO3
no change
white
whitz
no change
2
6 Bach
2k.es
ich Calo,
Hellomsn
7 Licos
Illow
9 9 KBr
no chong-
Goal: Identify the identity
HCIL DI H₂O
of the compound in an unknown ! Nach (hanged to
no Change
aqueous salt solution by using 3 Lic!
no change
qualitative chemical test.
no change
Cloudy forms bubble
ho change
Safety:
fonty Cleanochang e
no Change
s Naco
forms bubbles
no change
Waste:
forms hubbly
no change
y Cain) cloudly site no change
ho change
lo obtain the ten standard
cloudly selloch no change
aqueous Salt solutions
1o BalNo), Teatre
no Change
2. obtain the unknown aqueous
Ihknowl white
no change
salt solution
unknown compound, CalNoz
unknown! anion i Nos
unknown salt ! Ca
3. By column, add 3 drops of Conclusion
each the 10 Standard aqueous
from the flame test
Salt solutions, and unknown A and the qualitative chemical test
to rows A, C, and I of 966- he I conclude that Unknown
well plate
if” is has no or is No.
because it was clear when.
4. By row, add 3 drops of each
Weadded Ag Noz to it and
test reagent to each cell
didn’t change when we added
Containing a standard, oo the unknown
HCl and we can notice that
A, solution.
for CacNoz), and Ba(NO 1₂
the same thing happened.
5. Record the results of adding
the test reagent to the standard
solutions
6. Record the result of adding
the design identify the
anion in unknown A
7. Identify the compound in unknownt
Date
Date
Witness/TA
Signature
Note: Insert Divider Under Copy Sheet Before Writing
THE HAYDEN-MCNEIL STUDENT LAB NOTEBOOK
Chem 151L
Chemical Reactions Discovery Experiment
Take Home Work
1. At the beginning of the semester, you performed two different qualitative analysis tests on a set of
solutions: a) 0.1 M AgNO3 (aq), and, b) 1 M HCl (aq). Use your data/results from Experiments #1
to complete this table.
Table 3
Which chemicals
reacted with
AgNO3(aq)?
(a “positive” test)
Which chemicals did
not react with
AgNO3(aq)?
(a “negative” test)
Which chemicals
reacted with
HCl (aq)?
(a “positive” test)
K₂CO3
Na₂CO₃
Naci
Lici
Baci
K, co
Na₂CO₃
Which chemicals did
not react with
HCl (aq)?
(a “negative” test)
NaCl
Licl
BaCl2 ,
CaCO3
Ca(NO3)2
KBr.
Bado,
What observation did
these have in common?
Liz Cos
What observation did
these have in common?
What observation did
these have in common?
What observation did
these have in common?
2. In the context of that experiment, what was each testing for?
Table 4
Test Reagent
Observation
From this observation I can
(i.e. bubbles, solid formed, color infer the presence of:
change, etc)
(i.e. name a specific element or
ion, or category of elements or
ions)
AgNO3(aq)
HCl(aq)
3. Based on the equations you have written and on the solubility rules, explain whether or not the
positive and negative results seem reasonable for the AgNO3 test. Do you have any results that do
not seem consistent with the reactivity guidelines and solubility rules?
4. Explain whether or not the positive and negative results seem reasonable for the HCl test. Do you
have any results that do not seem consistent with the reactivity guidelines and solubility rules?
University of San Diego, Department of Chemistry & Biochemistry, Fall 2019
1
Chem 151L
Chemical Reactions Discovery Experiment
5. Write the overall and the net balanced chemical equations for every reasonable positive test in
Table 3. Identify spectator ions. Use a separate sheet of paper, if needed.
ol
1328
0
10
ya
6. Big picture generalizations. (Hint: it may help to refer to page 4.)
a.
Write the net ionic chemical equation for the generic reaction of an acid (H) with a metal (M).
In this case, assume that the metal forms a 2 charge when it reacts.
b. Both carbonate CO32- and hydrogen carbonate HCO3- react with acids. Write net ionic
chemical equation for the generic reaction of an acid (H’) with each.
University of San Diego, Department of Chemistry & Biochemistry, Fall 2019
2

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