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NEET levelSingle correct optionDifficulty 1 of 3ie118

A weak acid buffer works effectively over the approximate pH range

A $p K_{a} \pm 5$
B0 to 14 for any weak acid
C $p K_{a} \pm 1$
D $p K_{a} \pm 0.01$

Answer: C

Henderson equation shows that salt/acid ratios from 1/10 to 10/1 keep the buffer useful, giving

pH = p K_{a} \pm 1

.

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