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Consider the dissolution of AB(s): AB(s)⇌A+(aq)+B−(aq) Le Châtelier's principle tells us that an increase in either...

Consider the dissolution of AB(s): AB(s)⇌A+(aq)+B−(aq) Le Châtelier's principle tells us that an increase in either [A+] or [B−] will shift this equilibrium to the left, reducing the solubility of AB. In other words, AB is more soluble in pure water than in a solution that already contains A+ or B− ions.

This is an example of the common-ion effect. The generic metal hydroxide M(OH)2 has Ksp = 5.85×10−18.

Part A

What is the solubility of M(OH)2 in pure water? Express the molar solubility numerically using three significant figures.

Part B

What is the solubility of M(OH)2 in a 0.202 M solution of M(NO3)2? Express the molar solubility numerically using three significant figures.

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