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NEET levelSingle correct optionDifficulty 1 of 3ie113

A buffer contains equal concentrations of a weak acid HA and its sodium salt NaA. If $p K_{a}$ of HA is 4.76, the pH of the buffer is

A2.38
B7.00
C9.24
D4.76

Answer: D

Henderson equation:

pH = p K_{a} + lo g ([A^{-}] / [HA])

. With equal concentrations the log term is

lo g 1 = 0

, so pH =

p K_{a}

= 4.76.

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