What is the concentration of the Mg2+ ion in solution when [CO32-] = 0.25 M given that the Ksp = 6.82 × 10-6 for the following reaction: MgCO3(s) ⇌ Mg2+ (aq) + CO32- (aq) ?
A) 5.2 × 10-2
B) 3.7 × 104
C) 2.7 × 10-5
D) 19.2
E) none of the above
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