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An acidic solution has pH 2 and another acidic solution has pH 5. How many times higher is the hydrogen ion concentration in the first solution?

Answer and explanation

Correct answer: One thousand times

The pH relation is [H⁺] = 10⁻ᵖᴴ. Therefore, the ratio of the concentrations is 10⁻² ÷ 10⁻⁵ = 10³ = 1000. Equivalently, the pH difference is three units, and every one-unit decrease in pH means a tenfold increase in hydrogen-ion concentration. Hence the first solution has 1000 times more H⁺ and option A is correct.

Related tags

Ph-ScaleHydrogen-IonAcid-StrengthAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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