The only way increase the buffer capacity is to increase the total concentration of the system (conjugated acid + base).
The buffer capacity can be defined as the amount of strong base needed to change the pH of 1 liter of solution by 1 pH unit.
To increase buffer capacity to modify buffer solution-
The buffer capacity of a buffer, consisting of a weak acid and its conjugated base is given by the following equation:
π=㏑ 10 [{H⁺} + K ÷ H⁺ + CKα [H⁺] ÷ [H⁺] + Kα]
With [H^+] the concentration of the H^+ ion ; C the total buffer concentration (i.e. acid + conjugated base) and Kα the acidity constant.
It is clear from this equation that the buffer capacity is directly proportional to the concentration.
So the only way increase the buffer capacity is to increase the total concentration of the system (conjugated acid + base).
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