What is the [H+] in a 0.10 M solution of ascorbic acid,C6H8O6?

Answer 1

Ascorbic acid = HA
................HA ==> H^+ + A^-
initial.........0.1.....0......0
change..........-x......x......x
equil..........0.1-x.....x.....x

Ka = (H^+)(A^-)/(HA)
Substitute from the ICE chart and solve for x, then convert to pH.