Determine the pH of (a) a 0.25 M CH3COOH solution and (b) a solution that is 0.25 M CH3COOH and 0.15 M CH3COONa. Ka for CH3COOH = 1.8 X 10-5. Why could you have predicted that the pH would rise after addition of sodium acetate to pure 0.40 M acetic acid from part (a) by applying Le Chatelier's principle?