1. A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. 2. Calculate the pH when 27.6 mL of 0.048 MHCl is added to 100.0 mL of the above buffer.