CHEM 113 Lecture Notes - Buffer Solution
Document Summary
Because ph = pka + log [a+] / [ha], start with ph = pka. Then, determine [ha] and [a-] to give you the exact ph. Buffer capacity the ability of the buffer solution to resist changes in ph. More concentrated buffer components = greater buffer capacity. Buffer range the ph range over which the buffer acts effectively. [a-] / [ha] should be close to 1 (no larger than 10, no smaller than 0. 1) This will give you an effective ph range of +/- 1. The farther this ratio gets from 1, the less efficient the buffer (the smaller the buffer range)
