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  4. An aqueous solution of HCl is 10-9 M HCl. The pOH of the solution should be

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Q. An aqueous solution of $HCl$ is $10^{-9} M HCl$. The $pOH$ of the solution should be

Solution:

$pH$ of $10^{-9} M HCl$ is in between $6$ and $7$ (since it is very dilute and $H ^{+}$ from water cannot be neglected.)
$\therefore $ Total $\left[ H ^{+}\right]=10^{-9}+10^{-7}=1.01 \times 10^{-7}$
Hence, $pOH$ will be the between $7$ and $8$ .