Calculate pH of a weak acid/conjugate base buffer solution. Calculate the pH of 590.0 mL of a 0.341-M solution of hypochlorous acid before and after the addition of 0.245 mol of potassium hypochlorite.
a) 2.34 before, 2.55 after
b) 2.55 before, 2.34 after
c) 4.67 before, 4.92 after
d) 4.92 before, 4.67 after