MY and `NY_(3)` two nearly insoluble salts, have the same `K_(sp)` values of `6.2xx10^(-13)` at room temperature. Which statement would be true in rearged to MY and `NY_(3)` ?

Options

A. the salts MY and `NY_(3)` are more soluble in 0.5 M KY than in pure water.
B. The addition of the salt of KY to solution of MY and `NY_(3)` will have no effect on their solubilites.
C. The molar solubility of MY and `NY_(3)` in water are identical.
D. The molar solubility of MY in water is less than that of `NY_(3)`

Answer

D

Explanation

For salt `MY, K_(sp) =S_(1)^(2).`
`S_(1) =sqrt(K_(sp)) =sqrt(6.2 xx 10^(-13)) =7.8 xx 10^(-7) "mol"^(-1)`
`" For salt " NY_(3), K_(sp) =27S_(2)^(4)`
`S_(2) = 4sqrt((6.2 xx 10^(-13))/(27)) = 3.89 xx 10^(-4) " mol"^(-1)`
Molarity solubility of salt MY in water is less than that of salt `NY_(3)`.