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 addition of the salt of KY to solution of will have no effect on their solubilities
B. The molar solubilities of MY and NY in identical
C. The molar solubility of MY in water is less than `NY_3`
D. The salts MY and `NY_3` are more soluble in than in pure water

Answer

C

Explanation

For `MY harr underset(S)(M^(+))+underset(S)(Y^(-))`
`K_(sp)=6.2xx10^(-13)`
`S=7.9xx10^(-7) mol L^(-1)`
For `NY_3 harr N^(3+)+3Y^(-)`
`K_(sp)=27 S^4 implies S=((K_(sp))/(27))^(1//4)`
`S=3.89xx10^(-4) mol L^(-1)`
So, solubility of `NY_3` is more than solubility of MY water. And addition of KY decrease the solubility because common ion effect.