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Ways to Define Concentration

Which solutio...

Question

Which solution has a $p H$ of $13$ ?

0.1 M

M g C l_{2}

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0.1 M

H C l O_{4}

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0.1 M

N H_{4} O H

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0.1 M

K O H

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Solution

The correct option is D $0.1 M$ $K O H$
$p H = 13 > 7$ or $p O H = 1$
Hence it is false
From the given options, $p O H$ of $0.1$ $M$ $K O H = - log 0.1 = 1$
and hence $p H = 13$
Hence, $0.1$ $M$ $K O H$ is the correct option.
$0.1$ $M$ $N H_{4} O H$ is incorrect because, even if it is a base,
it will have $p H$ different from $13$ as it is a weak base.

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