Question

Which is the solubility product expression for CaF2(s)? 

[Ca2+]/[F–]2 
[Ca2+][F2–] 
[Ca]+[F]2 
[Ca2+][F–]2

Answer 1

Answer : The correct expression is, $[Ca^{2+}][F^-]^2$

Explanation :

Solubility product : It is defined as when the sparingly soluble salt is dissolved in water, the equilibrium is established between the undissolved solid salt and dissolved salt.

The given compound is, $CaF_2$

The equilibrium solubility reaction will be,

$CaF_2(s)\rightleftharpoons Ca^{2+}(aq)+2F^-(aq)$

The solubility product expression for $CaF_2$ is,

$K_{sp}=[Ca^{2+}][F^-]^2$

Hence, the correct expression is, $[Ca^{2+}][F^-]^2$