Henderson - The Hasselbalch equation pH of an acidic or a basic buffer can be calculated by Henderson- Hasselbalch equation.

For acidic buffers, 

When  , then,   and

when , then, 

    So weak acid may be used for preparing buffer solutions having pH values lying within the ranges pK_a + 1 and pK_a - 1. The acetic acid has a pK_a of about 4.8; it can, thus, be used for making buffer solutions with pH values lying roughly within the range of 3.8 to 5.8.

For basic Buffers, 

Knowing pOH, pH can be calculated by the application of formula, pH+pOH=14

pH of the buffer solution does not change with the dilution but it varies with temperature because value of K_w changes with temperature.

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