Solubility Review Questions Worksheet With Answers Page 12
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14SOLUBILITY REVIEW QUESTIONS
For the remainder of the questions, marks will be awarded as shown. Your steps and
assumptions leading to a solution must be shown. In questions involving calculations, full
marks will not be given for providing only an answer. Students will be expected to
communicate the knowledge and understanding of chemical principles in a clear and logical
manner.
1.
For the reaction
2 Ag
+
2-
Ag
CO
+ CO
2
3 (s)
(aq)
3
what will be the effect on the position of this equilibrium of adding solid AgNO
?Give a
3
brief explanation for your answer. (2 marks)
-3
2.
The solubility of thallium iodate, TlIO
, is 1.5 x 10
M at 25C.
3
What is the K
at this temperature? (2 marks)
sp
-6
3.
Explain why a precipitate of AgCl will NOT be produced when 20.0 mL of 3.00 x 10
M
-4
-10
AgNO
is mixed with 30.0 mL of 1.00 x 10
M NaCl. For AgCl, the K
= 1.8 x 10
.
3
sp
Support your explanation by calculation. (4 marks)
4.
The equilibrium in a saturated ZnF
solution is given by:
2
Zn
2+
-
ZnF
+ 2 F
2 (s)
(aq)
(aq)
Predict the effect on the solubility of ZnF
of adding some solid KF. Explain the
2
reasoning for your prediction. (2 marks)
5.
What is the minimum mass of Na
SO
crystals that must be dissolved in 5.0 L of
2
4 (s)
0.0010 M Ca(NO
)
solution in order to initiate precipitation of calcium sulphate? (4
3
2
-5
marks) K
for CaSO
= 2.6 x 10
sp
4
6.
Calculate the value of the K
for SrF
if the solubility is 0.122 g/L. (4 marks)
sp
2
-8
7.
The K
for PbSO
is 1.3 x 10
at 25C. Calculate the mass in grams of PbSO
which
sp
4
4
could be dissolved in 5.0 L of water at 25C. (3 marks)
8.
30.0 mL of 0.10 M LiCl is added to 20.0 mL of 0.20 M Na
CO
. The K
for Li
CO
is 1.7
2
3
sp
2
3
-3
x 10
. WIll Li
CO
precipitate? Support your answer with calculations. (3 marks)
2
3
-
2=
9.
A beaker contains OH
and S
ions in solution, both at a concentration of 0.10 M. You
-
2=
are asked to precipitate the OH
while leaving the S
in solution.
a) Which reagent could you use? (1 mark)
b) Write a net ionic equation for the precipitation reaction. (1 mark)
10. Show by calculation and state whether or not a precipitate of BaSO
will form when
4
-5
0.150g of K
SO
is added to 2.00 L of 1.70 x 10
M BaCl
solution. K
of BaSO
=
2
4
2 (aq)
sp
4
-9
1.5 x 10
. (4 marks)
11. What happens to the solubility of CaSO
when K
SO
is added to a saturated solution of
4
2
4
CaSO
? Explain your answer. (2 marks)
4
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