Calculate the maximum concentration (in M)of magnesium ions (Mg⁺²)in a solution that contains 0.025 M of CO₃²^-. The K_sp of MgCO₃ is 3.5 × 10^-8. A)1.8 × 10^-5 B)1.4 × 10^-6 C)2.8 × 10^-6 D)3.2 × 10^-10 E)8.1 × 10^-12

Question

Quizplus · Accepted Answer

First, write the balanced equation for the dissolution of MgCOS:

MgCOS (s) ⇌ Mg2+ (aq) + COS2- (aq)

The Ksp expression for MgCOS is:

Ksp = [Mg2+][COS2-]

We know the Ksp value and the concentration of COS2-, so we can solve for the maximum concentration of Mg2+.

Ksp = 3.5 × 10-8 = [Mg2+][COS2-]

[COS2-] = 0.025 M

[Mg2+] = Ksp/[COS2-] = (3.5 × 10-8)/(0.025) = 1.4 × 10-6 M

Therefore, the maximum concentration of Mg2+ in the solution is 1.4 × 10-6 M, which corresponds to answer choice B.

Calculate the Maximum Concentration (In M)of Magnesium Ions (Mg+2)in a Solution

Calculate the Maximum Concentration (In M)of Magnesium Ions (Mg⁺²)in a Solution