Version 573 – Exam 1 – Laude – (52390)
1
This
print-out
should
have
29
questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
001
6.0 points
What would be the pH of a solution of hypo-bromous acid (HOBr) prepared by dissolving9.7 grams of the acid in 20 mL of pure wa-ter (H2O)? The Ka of hypobromous acid is
6.0 points
Rank following salts from most to least solu-
ble:
BiI
K
sp
= 7
.
7
×
10
−
19
Cd
3
(AsO
4
)
2
K
sp
= 2
.
2
×
10
−
33
AlPO
4
K
sp
= 9
.
8
×
10
−
21
CaSO
4
K
sp
= 4
.
9
×
10
−
5
1.
AlPO
4
<
BiI
<
Cd
3
(AsO
4
)
2
<
CaSO
4
correct
Molar solubility can be approximated by
taking the n
th
root of the K
sp
where n is the
number of ions in the salt. Doing so results in
approximate molar solubilities of 10
−
10
, 10
−
7
,
10
−
11
and 10
−
3
for bismuth iodide, cadmium
arsenate, aluminum phosphate and calcium
sulfate, respectively.
Arranging these from
least to greatest produces:
AlPO
4
<
BiI
<
4.0036.0 pointsDetermine the molar solubility of calciumchloride (CaCl2) if
1.
9
correct
2.
5
3.
1
4.
13
5.
10.5

Version 573 – Exam 1 – Laude – (52390)
2
0056.0 pointsConsider the following exothermic reaction:CaO(s) + CO2(g)←→CaCO3(s)In response to a decrease in temperature, thesystem would:
0066.0 pointsConsider the reaction,Na+(aq) + Cl−(aq)←→NaCl(aq)The equilibrium constant,K, is 2.If theconcentrations of Na+, Cl−and NaCl are 2, 2and 10 M, respectively, which of the followingwould occur?

