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Inequality

The value of ...

Question

The value of $p K_{w}$ at $25^{o} C$ is

7

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- 14

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14

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1 \times 10^{- 14}

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Solution

The correct option is A $14$
Solution:- (C) $14$
$H_{2} O ⟶ H^{+} + {O H}^{-}$
At $25 ℃$ ,
$[H^{+}] = [{O H}^{-}] = 1 \times 10^{- 7} m o l / L$
$∴ K_{w} = [H^{+}] [{O H}^{-}]$
$\Rightarrow K_{w} = (1 \times 10^{- 7}) \times (1 \times 10^{- 7}) = 10^{- 14}$
Therefore,
$p K_{w} = - log (10^{- 14}) = 14$

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