K_(a) for ascorbic acid ("HA sc" )is 5xx10^(-5). Calculate the hydrogen ion concentration and percentage of hydrolysis in an aqueous solution in which the concentration of Asc^(-) ions is 0.02 M.

K_(a) for ascorbic acid ("HA sc" )is 5xx10^(-5). Calculate the hydroge

1.	K_(a) for ascorbic acid ("HA sc" )is 5xx10^(-5). Calculate the hydrogen ion concentration and percentage of hydrolysis in an aqueous solution in which the concentration of Asc^(-) ions is 0.02 M.
Answer» Solution :As ascorbic ACID is a weak acid, aqueous solution of `Asc^(-)`means the solution of a salt of weak acid with strong base. For such a salt , degree of hydrolysis is GIVEN by `h=sqrt((K_(w))/(K_(a)xxc))=sqrt((10^(-14))/(5xx10^(-5)xx2xx10^(-2))=10^(-4) = 10^(-4) xx 100 % = 0.01 % ` `{:(Asc^(-),+,H_(2)O,hArr,HAsc,+,H^(-),),(c " mol" L^(-1),,,,,,,),(c -ch ,,,,ch,,ch,):}` `[OH^(-)]=ch=0.02xx10^(-4)=2XX10^(-6) "mol " L^(-1) :. [H^(+)]=(K_(w))/([OH^(-)])=(10^(-14))/(2xx10^(-6))=5xx10^(-9) "mol" L^(-1)`