A(OH)_2is a partially soluble substance and itsK_(sp) "value is " 4xx10 ^(-12)Which of the following statement is/are correct ?

A(OH)_2is a partially soluble substance and itsK_(sp) "value is " 4xx1

1.	A(OH)_2is a partially soluble substance and itsK_(sp) "value is " 4xx10 ^(-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`