What can be permitted concentration of Ag^(+) ionsin0.1 M HCN solution buffered at pH =3 without causing precipitation of AgCN. K_(sp) " of " AgCN =1.2 xx 10 ^(-16),K_a " of "HCN = 4.8 xx 10^(-10 )

What can be permitted concentration of Ag^(+) ionsin0.1 M HCN solution

1.	What can be permitted concentration of Ag^(+) ionsin0.1 M HCN solution buffered at pH =3 without causing precipitation of AgCN. K_(sp) " of " AgCN =1.2 xx 10 ^(-16),K_a " of "HCN = 4.8 xx 10^(-10 )
Answer» `1.6 xx 10 ^(-5)M` ` 2.5 xx 10^(-9) M` ` 8.0 xx 10^(-6) M` ` 1. 65 xx 10^(-6) M` Solution :` [Ag^(+) ] [CN^(-) ] LT Ksp , ([H^(+)][CN^(-) ])/( [HCN])=Ka` ` rArr (10 ^(-3) xx [CN^(-) ])/( (0.1) )=4.8 xx 10 ^(-10) ` `rArr [CN^(-) ] =4.8 xx 10 ^(-8) ` ` rArr [Ag^(+)] =(1.2 xx 10 ^(-16))/( 4.8 xx 10 ^(-8) ) = 2.5 xx 10 ^(-9) `