Co(OH)2(s) -----------> Co^2+ (aq) + 2OH^- (aq)
s 2s
Ksp = [Co^2+][OH^-]^2
5.92*10^-15 = s*(2s)^2
5.92*10^-15 = 4s^3
s = 1.14*10^-5
solubility of Co(OH)2 is 1.14*10^-5 mole/L
molar mass of Co(OH)2 = 92.948g/mole
solubility of Co(OH)2 = 1.14*10^-5mole/L * 92.948g/mole
= 1.06*10^-3 g/L >>>>answer
CoCl2(aq) ------------. Co^2+ (aq) + 2Cl^- (aq)
0.01M
Co(OH)2(s) -----------> Co^2+ (aq) + 2OH^- (aq)
s+0.01 2s
Ksp = [Co^2+][OH^-]^2
5.92*10^-15 = (s+0.01)*(2s)^2 [ s + 0.01 = 0.01 , s<<<<<0.01]
5.92*10^-15 = (0.01)*(2s)^2
s = 3.85*10^-7
solubility of Co(OH)2 is 3.85*10^-7 mole/L
molar mass of Co(OH)2 = 92.948g/mole
solubility of Co(OH)2 = 3.85*10^-7mole/L* 92.948g/mole
= 3.6*10^-5 g/L
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