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JEE Advanced levelNumerical answerDifficulty 3 of 3ie151

200 mL of a buffer containing 0.30 M HA and 0.30 M NaA ( $p K_{a} = 4.76$ ) is mixed with 50 mL of 0.20 M NaOH. Find the pH to two decimals.

Numerical answer type, tolerance 0.01.

Answer: 4.9061

HA = 60 mmol, A

^{-}

= 60 mmol; NaOH 10 mmol gives HA = 50, A

^{-}

= 70 mmol. pH =

4.76 + lo g (70/50) = 4.76 + 0.146 = 4.91

.

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