A solution contains [Ba2+] = 5.0 × 10-5 M, [Ag+] = 3.0 × 10-5 M, and [Zn2+] = 2.0 × 10-7 M. Sodium oxalate is slowly added so that [C2O42-] increases.
Salt BaC2O4 ZnC2O4 Ag2C2O4
Ksp 1.5 × 10-8 1.35 × 10-9 1.1 × 10-11
Which one of the oxalates precipitates first?
A) BaC2O4
B) Na2C2O4
C) ZnC2O4
D) Ag2C2O4
E) ZnC2O4 and Ag2C2O4 precipitate together
Correct Answer:
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