Solubility equilibria
Pg 338 #36 - 38
#36 a) CuCl2 (s) ↔ Cu 2+ (aq) + 2 Cl - (aq)
b) BaCl2 (s) ↔ Ba 2+ (aq) + 2 Cl - (aq)
c) Ag2SO4 (s) ↔ 2Ag+ (aq) + SO4 2- (aq)
d) Ag2CO3 (s) ↔ 2 Ag+ (aq) + CO3 2- (aq)
#37 Ksp = 2.25 x 10 -16
#38 Ksp = 3.17 x 10 -11
Pg 347 #38-42, 46
#38 a) 1.6 x 10-6
b) 4.5 x 1021 molecules/L
#39 The ions of soluble compounds are not at equilibrium with the solid. The values of the solubility product constant apply to saturated solutions with an excess of solid.
#40 If the temperature of the solution rises the rate of the particles increases and the solubility of the salt increases. Therefore, the solubility constant will increase.
#41 To attain equilibrium, the reactants and the products must be present at the same time. In the case of solubilization, the compound that acts as the reactant is the solid; if it is not present, equilibrium will not be attained.
#42 For Pb ions = 1.35 x 10 -3 mol/L
For Ba ions = 1.05 x 10 -5 mol/L
So the ratio is 129, there are approx. 129 times more Pb ions
#46 1.34 x 10 -5 mol/L silver chloride
8.66 X 10-5 mol/L silver chromate
The molar solubility of silver chromate is higher than the molar solubility of silver chloride. A higher solubility constant does not necessarily indicate greater solubility.
Solubility product constant
#1 a) Yes, they can be compared this way, since the two ionic compounds are composed of ions in the same proportions, that is, the compounds give one cation for two anions.
b) The lead chloride, since its solubility product constant is greater.
#2 a) No, they cannot be compared this way, since the two ionic compounds are not composed of ions in the same proportions. Silver bromide produces one cation for one anion while iron hydroxide produces one cation for two anions.
b) solubility of AgBr = 7.31 x 10-7 mol/L
solubility of Fe(OH)2 = 2.30 x 10-6 mol/L
The compound that is most soluble is Fe(OH)2
#3 6.5 x 10-7
#4 0.15 g
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