 For comparison to be used in our next solution, I have a 0.1 molar solution of acetic acid. We have a pH of about 3.48. We now have a solution that is 0.1 molar in acetic acid and 0.1 molar in sodium acetate. Notice that the pH is significantly higher than the solution of just 0.1 molar acetic acid. We've added some of the conjugate base so the pH is higher. The first thing I want to do is add some distilled water to my buffer. Diluting the buffer does not change the pH. The ratio of the conjugate base to the weak acid stays constant and the pH of the buffer is unchanged.