Preparation of Buffer Solutions in General Chemistry II - Study Guide | CHEM 113, Study notes of Chemistry

Download Preparation of Buffer Solutions in General Chemistry II - Study Guide | CHEM 113 and more Study notes Chemistry in PDF only on Docsity! 25 March Preparing a Buffer – Method #1 Consider the desired pH Because pH = pKa + log [A +] / [HA], start with pH = pKa Then, determine [HA] and [A-] to give you the exact pH Mix. 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) Preparing a Buffer – Method #2 Consider the desired pH Partially neutralize an acid or base