Solid KCN is added to a solution composed of 0.10 M Ag⁺ and 0.10 M Zn²⁺ just until a precipitate forms.What is the composition of this initial precipitate? AgCN K_sp = 2.2 × 10^-16 and Zn(CN)₂ K_sp = 3 × 10^-16. A)The precipitate is pure AgCN(s). B)The precipitateis pure Zn(CN)₂(s). C)The precipitate is a mixture of AgCN(s)and Zn(CN)₂(s). D)The precipitate is a mixture of KCN(s)and AgCN(s). E)The precipitate is a mixture of KCN(s)and Zn(CN)₂(s).

Question

Quizplus · Accepted Answer

The precipitate is pure AgCN(s) because AgCN has a lower Ksp value (2.2 × 10^-16) compared to Zn(CN)2 (3 × 10^-16), indicating that AgCN is less soluble and will precipitate first when KCN is added to the solution.

Solid KCN Is Added to a Solution Composed of 0