Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

Correct answer: A. log (1/H+)

A. log (1/H+)
B. - log (1/H+)
C. 1/log H+
D. None of these

Explanation

By definition, pH = -log[H+], which is equivalently written as log(1/[H+]). The reciprocal form explains why a higher hydrogen-ion concentration gives a lower pH.

Written and checked by Zahid Hussain, MS Computer ScienceLast updated 18 September 2026

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Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

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