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

Answer

B

Explanation

`My to K_(sp) = s^(2) = 6.2 xx 10^(-13)`
`s= sqrt(6.2 xx10^(-13))`
`s = 7.87 xx 10^(-7) " mol " L^(-1)`
`NY_(3) to K_(sp) = 27 s^(2) = 6.2 xx 10^(-13)`
`s = ((6.2 xx 10^(-13))/27)^(1//4)`
`s = 3.89 xx 10^(-4) " mol L "^(-1)`
` :. ` molar solubility of `NY_(3)` is more than MY in water .