`K_(a)` for ascorbic acid `(Hasc)is 5xx10^(-5)`. Calculate the hydrogen in an aqueous solution in which the concentration of `Asc^(-)` ions in `0.02M`.

Explanation

`Asc^(-)=C.h=C sqrt([(K_(H))/(C )])=sqrt(K_(H).C)=sqrt([(K_(w))/(K_(a)).C])`
`= sqrt([(10^(-14)xx0.02)/(5xx10^(-5))])=2xx10^(-6)`
`:. [H^(+)]=(1xx10^(-14))/(2xx10^(-6))=5xx10^(-9)`
Also `h= sqrt([(K_(H))/(C )])=sqrt([(K_(w))/(K_(a)xxC])`
`=sqrt([(10^(-14))/(5xx10^(-5)xx0.02)])=10^(-4)=0.01%`