Question

Consider an amphoteric hydroxide, M(OH)2(s)M(OH)2(s), where MM is a generic metal.

M(OH)2(s)−⇀↽−M2+(aq)+2OH−(aq)Ksp=2×10−16M(OH)2(s)↽−−⇀M2+(aq)+2OH−(aq)Ksp=2×10−16

M(OH)2(s)+2OH−(aq)−⇀↽−[M(OH)4]2−(aq)Kf=0.02M(OH)2(s)+2OH−(aq)↽−−⇀[M(OH)4]2−(aq)Kf=0.02

Estimate the solubility of M(OH)2M(OH)2 in a solution buffered at pH = 7.0, 10.0, and 14.0.

solubility at pH = 7.0

MM

solubility at pH = 10.0

MM

solubility at pH = 14.0

M

Answer 1