What Is the Minimum Mass of Na₂CO₃ That Must Be

Multiple Choice

What is the minimum mass of Na₂CO₃ that must be added to 75.9 mL of a 9.0 × 10^-4 M AgNO₃ solution in order for precipitation to occur? For Ag₂CO₃,K_sp = 8.6 × 10^-12 .

A) 7.2 × 10^-3 g
B) 3.1 × 10^-4 g
C) 3.6 × 10^-3 g
D) 7.7 × 10^-8 g
E) 8.5 × 10^-5 g