Two hydroxide salts are listed below with their solubility–product constants measured…

CHEMISTRY · Multi-part · AP · Chemistry · Equilibrium · Equilibrium

Problem

Two hydroxide salts are listed below with their solubility–product constants measured at 25 °C.

Salt	Dissolution Equation	$K_{sp}$
Mg(OH) $_2$	Mg(OH) $_2$ (s) ⟶ Mg $^{2+}$ + 2 OH $^{-}$	$5.6\times10^{-12}$
Ca(OH) $_2$	Ca(OH) $_2$ (s) ⟶ Ca $^{2+}$ + 2 OH $^{-}$	$5.5\times10^{-6}$

Assume that

100\,\text{mL}

of pure water at 25 °C is available for each salt. (a) Without performing detailed numerical calculations, predict which salt has the greater molar solubility at 25 °C. Justify your prediction based on the information provided. (b) Taking into account both molar solubility and molar mass considerations, explain which salt is expected to produce the greater mass of dissolved solid in

100\,\text{mL}

of water. Support your explanation qualitatively without explicit numerical computation.

Related theory

Browse the problem library