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Introduction and Degree of Hydrolysis

Which of the ...

Question

Which of the following is not correct

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

for a neutral solution at all temperatures

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

for a neutral solution at all temperatures

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

and

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

for an acidic solution

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

and

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

, for an alkaline solution

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Solution

The correct option is A $[H^{+}] = [O H^{-}] = \sqrt{K_{w}}$ for a neutral solution at all temperatures
For a neutral solution, $[H^{+}] = [O H^{-}]$
$∵ K_{w} = [H^{+}] [O H^{-}]$
$\Rightarrow$ At all temperatures, for a neutral solution,
$[H^{+}] = [O H^{-}] = \sqrt{K_{w}}$
Note: The value of $K_{w}$ changes according to the temperature.

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