What is minimum concentration of `SO_(4)^(2-)` required to precipitate `BaSO_(4)` in solution containing `1 xx 10^(-4)` mole of `Ba^(2+)` ? (`K_(sp)` of `BaSO_(4) = 4 xx 10^(-10)`)

Options

A. `2 xx 10^(-3) M`
B. `2 xx 10^(-5) M`
C. `4 xx 10^(-10) M`
D. `4 xx 10^(-6)`

Answer

D

Explanation

to get precpitate Ionic product is `gt K_(sp)`
The minimum Conc. Of. `SO_(4^(-2))` to get
Precipitate `= (K_(sp))/([Ba^(+2)])`
`= (4 xx 10^(-10))/(1 xx 10^(-4)) = 4 xx 10^(-6)`