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JEE Main levelSingle correct optionDifficulty 2 of 3ie015

At a certain temperature pure water has pH $= 6.5$ . At the same temperature the pH of $0.01 M$ $NaOH$ is

A $12$
B $10.5$
C $11$
D $13$

Answer: C

In pure water

[H X^{+}] = [OH X^{-}] = 1 0^{- 6.5}

, so

K_{w} = 1 0^{- 13}

and

p K_{w} = 13

. For

0.01 M

NaOH

,

pOH = 2

and

pH = 13 - 2 = 11

(not 12).

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