Higher the amount of acid or base used to produce a definite change of pH in a buffer solution, higher will be its buffer capacity.Buffer capacity is maximum under the following conditions.
[Salt] = [Acid] for acid buffer solution and [Salt] = [Base] for basic buffer solution.pH of a buffer lies in the range of . Any buffer solution can be used as buffer up to two units depending on or values. When pH = or solution is said to be efficient buffer.
For preparing a buffer solution of pH = 7.0, which of the buffer system will be selected?
A buffer of acetic acid with sodium acetate will be, when CH3COOH and CH3COONa are present in equivalent amounts has pH limits equal to:
So, weak acid may be used for preparing buffer solution having pH values lying within the range pKa + 1 and pKa - 1. The acetic acid has a pKa of about 4.8, it may, therefore, be used for making buffer solutions with pH values lying roughly within the range 3.8 to 5.8.
Buffer capacity is maximum when
Buffer capacity is maximum when [salt] = [base]
i.e., pOH = pKb for base buffer under above condition. the buffer is called efficient.
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