`A(OH)_(2)` is a partially soluble substance and its `K_(sp) ` value is `4 xx 10^(-12)` . Which of the following statement is / are correct ?

Options

A. The solubility is unaffected by pH of the medium
B. Its solubility increases in a buffered medium having pH = 2
C. Its solubility decreases in a buffered medium having pH= 9
D. Its saturated solution has pH =10.3

Answer

B, C, D

Explanation

` A(OH) _2 hArr A^(+2) +2OH^(-) `
` " " S " " 2S `
` 4 xx 1 0^(_12) =4S ^(3) rArr S =1 0 ^(_4) M`
` [OH^(-)] = 2 xx 10^(_4) M`
` pOH =4- log 2 = 3.7 rArr pH =10.3`