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  4. pOH of water is 7.0 at 298 K. If water is heated to 350 K, which of the following should be true ?

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Q. pOH of water is 7.0 at 298 K. If water is heated to 350 K, which of the following should be true ?

Equilibrium

Solution:

At $298\, K$, for pure water $pH = pOH = 7$. On increasing the temperature, the self ionisation of water increases thereby increasing the concentrations of $H_{3}O^{+}$ as well as $OH^{-}$ ions. Consequently, at high temperature, the $pH$ as well as $pOH$ will be $<\, 7$