Question

The precipitate of CaF₂ (K_sp =1.7 x 10^-10) is obtained, when equal volumes of the following are mixed

(a) 10^-4MCa²⁺ + 10^-4MF^-

(b) 10^-2MCa²⁺ + 10^-3MF^-

(c) 10^-5MCa²⁺ + 10^-3MF^-

(d) 10^-3MCa²⁺ + 10^-5MF^-

Answer 1

The correct option (b)10^-2MCa²⁺ + 10^-3MF^-

Explanation:

The precipitate will form only when 

Ionic product > Solubility product 

CaF₂ dissociates as follows