Problem: Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal.M(OH)2 (s) ⇌ M2+ (aq) + 2OH- (aq)     Ksp = 2 x 10-16M(OH)2 (s) + 2OH- (aq) ⇌ M(OH)42- (aq)    Kf = 0.060Estimate the solubility of M(OH)2 in a solution buffered at pH = 7.0, 10.0, and 14.0.

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FREE Expert Solution

M(OH)2 (s) ⇌ M2+ (aq) + 2OH- (aq)

From this balanced equation we can see that equilibrium expression for Ksp:

Ksp= [M2][OH-]22 = 2 x 10-16

This is so because we have 1 mole of M(OH)2 producing 1 mole of M2+ and 2 moles of OH-.

We are looking for Molar solubility, or x. In our equation, [M2] = x, so we need to solve for  [M2].

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Problem Details

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

M(OH)2 (s) ⇌ M2+ (aq) + 2OH- (aq)     Ksp = 2 x 10-16



M(OH)2 (s) + 2OH- (aq) ⇌ M(OH)42- (aq)    Kf = 0.060

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

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