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If an acidic solution is diluted with water and its pH changes from 2 to 4, what happens to its hydrogen-ion concentration?

Answer and explanation

Correct answer: It decreases one hundred times

The governing relation is pH = −log[H⁺]. Therefore, an increase of one pH unit means a tenfold decrease in hydrogen-ion concentration. Here pH rises from 2 to 4, an increase of two units, so [H⁺] decreases by 10² = 100 times. Thus option A is correct. Option B reverses the logarithmic relationship, while C treats pH as a linear scale and D ignores the change in pH.

Related tags

PhDilutionHydrogen Ion ConcentrationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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