A 0.04L sample of ascorbic acid, HA, is titrated with 0.03L of a 0.28 mol/L potassium hydroxide solution. What is the pH of the resulting solution at the equivalence point, if Ka for ascorbic acid is 9.1×10-5? Input your answer with exactly 2 decimal places. ex: If your answer is 1.2, enter 1.20.