Ascorbic acid (H2C6H6O6) is a diprotic weak acid; it's two Ka values are 8.0x10-5 and 1.6x10-12. Calculate (approximate) the pH of a 0.30M solution of ascorbic acid. Must use an ICE table (Initial Concentration, Change in Concentration, Equilibrium Concentration) and the quadratic formula unless the "x is small" approximation can be used.