The pH of 0.005 M codeine (C_(18)H_(21)NO_(3)) solution is 9.95. Calculate its ionization constant and pK_(b).

The pH of 0.005 M codeine (C_(18)H_(21)NO_(3)) solution is 9.95. Calcu

1.	The pH of 0.005 M codeine (C_(18)H_(21)NO_(3)) solution is 9.95. Calculate its ionization constant and pK_(b).
Answer» Solution :CODEINE + water `hArr` codeniumion + `OH^(-)` Form GIVEN pH, `[H^(+)] = 1.12xx10^(-10) M` `:. [OH^(-)] = (K_(w))/([H^(+)]) = (10^(-14))/(1.12xx10^(-10))=8.93xx 10^(-5)M` `K_(B) = ([B^(+)] [OH^(-)])/([BOH]) = ((8.93xx10^(-5))^(2))/(0.005)=1.6xx10^(-6)`.