Answer to Question #237100 in General Chemistry for Nana

Question

A solution contains 0.0021 M Ag⁺ and 1.6 x 10^-5 M Zn²⁺, and the ions need to be separated. For this purpose  is added to the solution so that both Ag₂CO₃ (K_sp = 8.1 x 10^-12) and ZnCO₃ (K_sp = 1.0 x 10^-10) can precipitate from the solution. What will the concentration of be just before the first salt starts to precipitate. (Please give your answer with 2 significant figures.)

Answer 1

1.6 × 10^-5/(8.1 × 10^-12 × 1.0× 10^-10)

= 1.975 × 10¹⁶

Molar mass of AgCO₃ = 275.7453 g/mol

= 1.975/275.7453

= 7.1g/mol