The term pH is defined as:

log

H^{+}

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-log 1/(

H^{+}

)

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-log

(H^{+})^{2}

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log 1/(

H^{+}

)

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Solution

The correct option is A log 1/( $H^{+}$ )
$p H$ is defined as negative logarithm of $H^{+}$ ion concentration in the solution.
$p H = - {log}_{10} [H^{+}] = {log}_{10} (\frac{1}{H^{+}})$

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