# Chemistry Worksheets

Chemistry 106, Chapter 16 Exercises
Concentrations of ions in solutions and Ksp
1. Using Ksp and the equilibrium concentration of one ion, calculate the equilibrium concentration of
the other ion.
-14
2+
-6
a. Cd(OH)
, Ksp = 2.5 x 10
, [Cd
] = 1.5 x 10
M
2
-9
3-
-4
b. Li
PO
, Ksp = 3.5 x 10
, [PO
] = 7.5 x 10
M
3
4
4
-4
+
c. AgNO
, Ksp = 6.0 x 10
, [Ag
] = 0.025
3
-
-4
+
-
] = 1.3 x 10
M , b. [Li
] = 0.016 M, c. [NO
] = 0.024 M
3
+
-
2. Calculate the equilibrium concentrations of Cu
and Cl
in a saturated solution of copper (I) chloride,
-6
+
-
-3
given Ksp = 1.02 x 10
. Ans. [Cu
] = [Cl
] = 1.01 x 10
M
2+
-
3. Calculate the equilibrium concentrations of Pb
and F
in a saturated solution of lead (II) fluoride if
-8
2+
-
Ksp = 3.2 x 10
. Ans. [Pb
] = 0.0020 M, [F
] = 0.0040 M
2+
3-
4. Calculate the equilibrium concentrations of Ba
and PO
in a saturated solution of Ba
(PO
)
if Ksp
4
3
4
2
-39
2+
-8
3-
-8
= 6 x 10
. Ans. [Ba
] = 2.7 x 10
M, [PO
] = 1.8 x 10
M
4
Calculating solubilities using Ksp
-39
-10
5. Calculate the molar solubility of Fe(OH)
in water. Ksp = 3 x 10
. Ans. 1 x 10
mol/L
3
-18
-5
6. Calculate the molar solubility of Ag
PO
in water. Ksp = 1.8 x 10
. Ans. 1.6 x 10
mol/L
3
4
-10
7. Calculate the solubility in grams/liter of silver chloride (143.3 g/mol) in water. Ksp = 1.8 x 10
.
-3
Ans. 1.9 x 10
g/L
8. Calculate the solubility in grams/liter of magnesium hydroxide (58.3 g/mol) in water.
-12
-3
Ksp = 6 x 10
. Ans. 7 x 10
g/L
9. How many grams of aluminum fluoride (84 g/mol) will dissolve in 250 mL of water?
-18
-4
Ksp = 1 x 10
. Ans. 3 x 10
g
-31
-7
10. Calculate the molar solubility of Sr
(PO
)
in water. Ksp = 1 x 10
. Ans. 2.5 x 10
mol/L
3
4
2
Common Ion Effect
11. Calculate the solubility in grams/liter of silver chloride (143.3 g/mol) in the following solutions.
-10
Ksp for AgCl = 1.8 x 10
.
-7
a. 0.025 M BaCl
. Ans. 5.2 x 10
g/L
2
-7
b. 0.17 M AgNO
. Ans. 1.5 x 10
g/L
3
12. Calculate the solubility in grams/liter of magnesium hydroxide (58.3 g/mol) in the following
-12
solutions. Ksp for Mg(OH)
= 6 x 10
.
2
-8
a. 0.041 M Ba(OH)
. Ans. 5 x 10
g/L
2
-3
b. 0.0050 MgCl
. Ans. 1 x 10
g/L
2