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pOH of $H_{2} O$ is 7.0 at 298 K. If water is heated at 350 K, which of the following statement should be true ?

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pOH will decrease

pOH will increase

pOH will remain 7.0.

concentration of $H^{+}$ ions will increase but that of $H^{-}$ will decrease.

answer is A.

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Detailed Solution

$[{OH}^{-}] = \sqrt{K_{W}}$ in pure water.

So as temperature increases $K_{W} decreases \Rightarrow [{OH}^{-}]$ decreases.

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