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The pH of a solution changes from 2 to 5. What happens to the hydrogen ion concentration?

Answer and explanation

Correct answer: It decreases one thousand times

The governing relation is pH = −log₁₀[H⁺]. Therefore, an increase of one pH unit means a tenfold decrease in hydrogen-ion concentration. The change from pH 2 to pH 5 is 5 − 2 = 3 units, so [H⁺] decreases by 10³ = 1000 times. Equivalently, the concentration changes from 10⁻² to 10⁻⁵ mol L⁻¹. Hence option C is correct; A and B count too few units, while D reverses the direction.

Related tags

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

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