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Auto Protolysis of Water

Which of the ...

Question

Which of the following expression is not true?

[H^{+}] = [O H^{-}] = \sqrt{K_{w}}

for a neutral solution at all temperatures.

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[H^{+}] > \sqrt{K_{w}}

[O H^{-}] < \sqrt{K_{w}}

for acidic solution

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[H^{+}] < \sqrt{K_{w}}

[O H^{-}] > \sqrt{K_{w}}

for an alkaline solution.

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[H^{+}] = [O H^{-}] = 10^{- 7} M

for a neutral solution at all temperatures.

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Solution

The correct option is D $[H^{+}] = [O H^{-}] = 10^{- 7} M$ for a neutral solution at all temperatures.
$K_{w} = [H^{+}] [O H^{-}]$

The value of $K_{w}$ increases with temperature.

Hence $[H^{+}]$ and $[O H^{-}]$ increase with temperature.

Option D statement is not true.

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