Buffer capacity : The property of a buffer solution to resist alteration in its pH value is known as buffer capacity. It has been found that if the ratio is unity, the pH of a particular buffer does not change at all. Buffer capacity is defined quantitatively as number of moles of acid or base added in one litre of solution as to change the pH by unity, which means
Buffer capacity
Thus greater the buffer capacity, greater is its capacity to resist the change in pH value. Buffer capacity is greatest when the concentration of salt and weak acid/base are equal, or when pH = pKa or pOH = pKb.
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