K_(a) for HCN is 5 xx 10^(-10) at 25^(@)C . For maintaining a constant pH of 9 , the volume of 5M KCN solution required to be added to 10 ml of2M HCN solution is

K_(a) for HCN is 5 xx 10^(-10) at 25^(@)C . For maintaining a constant

1.	K_(a) for HCN is 5 xx 10^(-10) at 25^(@)C . For maintaining a constant pH of 9 , the volume of 5M KCN solution required to be added to 10 ml of2M HCN solution is
Answer» 4 ML 7.95 ml 2 ml 9.3 ml ANSWER :C