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JEE Main levelSingle correct optionDifficulty 2 of 3ie131

Four buffers all have $[acid] = [salt]$ and the same acid. Which has the highest buffer capacity?

A0.01 M acid + 0.01 M salt
B1.0 M acid + 1.0 M salt
C0.1 M acid + 0.1 M salt
D0.001 M acid + 0.001 M salt

Answer: B

All have the same pH (

p K_{a}

), but capacity (moles of acid or base that can be absorbed per unit pH change) scales with the total concentration of the buffer components.

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