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If the pH of a solution increases from 3 to 6, what happens to its acidity?

Answer and explanation

Correct answer: Acidity decreases one thousand times

The governing concept is the logarithmic nature of pH: pH = −log10[H+]. An increase of one pH unit means a tenfold decrease in hydrogen-ion concentration. The change from pH 3 to pH 6 is three units, so [H+] becomes 10 × 10 × 10 = 1000 times smaller. Thus acidity decreases by a factor of 1000, making option A correct; it is not merely three times lower.

Related tags

Ph ScaleHydrogen IonsAcidityAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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