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For pure water, which of the following condition is valid at all temperature?

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pH = 7

pH + pOH = 14

pH = pK_w/2

pH – pOH = 7

answer is C.

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Detailed Solution

pH for pure water = 7 at only 25ºC
pH + pOH = 14 only at 25ºC
$pH = \frac{{pK}_{w}}{2}$ for pure water at all temperature

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