Solubility, Ksp Worksheet 1

Solubility, Ksp Worksheet 1
1. How many milliliters of 0.20 M AlCl 3 solution would be necessary to precipitate all of the Ag + from 45
ml of a 0.20 M AgNO 3 solution?
AlCl 3(aq) + 3 AgNO 3(aq) -----> Al(NO 3 ) 3(aq) + 3 AgCl (s)
(A) 15 ml (B) 30 ml (C) 45 ml (D) 60 ml
2. Which of the following salts has the greatest molar solubility in pure water?
(A) CaCO 3 (K sp = 8.7 x 10 -9 )
(B) CuS (K sp = 8.5 x 10 -45 )
(C) Ag 2 CO 3 (K sp = 6.2 x 10 -12 )
(D) Pb(IO 3 ) 2 (K sp = 2.6 x 10 -13 )
3. The solubility product of CaF 2 is 4.3 x 10 -11 . What is the molar solubility of CaF 2 in a 0.050 M solution
of Ca(NO 3 ) 2 ?
(A) 2.2 x 10 -4 M
(B) 1.0 x 10 -5 M
(C) 1.5 x 10 -5 M
(D) 8.4 x 10 -10 M
4. Silver oxalate Ag 2 (C 2 O 4 ) is dissolved in pure water. The concentration of Ag + ion in a saturated
solution is 2.2 x 10 -4 M. What is the Ksp of Ag 2 (C 2 O 4 )?
(A) 5.3 x 10 -12
(B) 1.1 x 10 -12
(C) 5.0 x 10 -8
(D) 2.4 x 10 -8
(E) 2.2 x 10 -4
5. What weight of silver chromate (Ag 2 CrO 4 ) will dissolve in 1.0 liter of a solution that is 0.010 M in Ag + ?
K sp Ag 2 CrO 4 = 1.9 x 10 -12 and FM Ag 2 CrO 4 = 332 g/mol.
(A) 1.9 x 10 -12 g
(B) 1.9 x 10 -8 g
(C) 1.4 x 10 -6 g
(D) 6.3 x 10 -6 g
(E) 4.7 x 10 -4 g
6. The solubility of CaF 2 in 1 x 10 -3 M KF
(A) is equal to the solubility of CaF 2 in pure water.
(B) is less than the solubility of CaF 2 in pure water.
(C) is greater than the solubility of CaF 2 in pure water.
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Solubility, Ksp Worksheet 1
7. A solution has the following concentrations:
[Cl - ] = 1.5 x 10 -1 M [Br - ] = 5.0 x 10 -4 M [CrO 2- 4 ] = 1.9 x 10 -2 M
A solution of AgNO 3 (100% dissociated) is added to the above solution, drop by drop. Which silver salt
will precipitate first?
K sp AgCl = 1.5 x 10 -10 K sp AgBr = 5.0 x 10 -13 K sp Ag 2 CrO 4 = 1.9 x 10 -12
(A) AgCl
(B) AgBr
(C) Ag 2 CrO 4
(D) AgCl and AgBr together
(E) none of the above
8. Suppose that CaF 2 is to be used as a fluoridation agent in a municipal water system. What is the [F - ] if
extremely hard water ([Ca 2+ ] = 0.070 M) is saturated with CaF 2 ? (K sp CaF 2 = 1.7 x 10 -10 )
(A) 1.3 x 10 -5 M
(B) 2.5 x 10 -5 M
(C) 5.0 x 10 -5 M
(D) 1.0 x 10 -4 M
(E) 0.070 M
9. Which of the following salts is most soluble in water?
(A) Mg(OH) 2 (B) CaS (C) (NH 4 ) 2 CO 3 (D) PbCl 2
10. A 2.00 g sample of a compound requires 268.0 ml of 0.100 M AgNO 3 to precipitate all of the
chloride ion in the compound. What is the percent of Cl - in the compound? (AM of Cl = 35.45)
(A) 47.6% (B) 95.1% (C) 23.8 % (D) 4.75 %
11. Predict what effect each of the following has on the position of the equilibrium.
PbCl 2 Pb 2+ (aq) + 2Cl- (aq)
∆H = +23.4 KJ
(A) The addition of Pb(NO 3 ) 2 solution.
(B) Increase the temperature.
(C) The addition of Ag + .
(D) The addition of HCl.
12. Which salt is the least soluble in water?
(A) Hg 2 CrO 4 (Ksp = 2.0 x 10 -9 )
(B) BaF 2 (Ksp = 1.7 x 10 -6 )
(C) CaF 2 (Ksp = 4.0 x 10 -11 )
(D) AgOH (Ksp = 1.5 x 10 -8 )
(E) BaCO 3 (Ksp = 8.0 x 10 -9 )
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