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 ?

A(OH)_(2)is a partially soluble substance and its K_(sp)value is 4 xx

1.	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 ?
Answer» The solubility is unaffected by pH of the MEDIUM Its solubility increases in a bufferedmediumhaving pH = 2 Its solubility decreases in a buffered medium having pH= 9 Its saturated solution has pH =10.3 Solution :` 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`