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Two solutions have pH values 2 and 6 respectively. How much greater is the hydrogen ion concentration in the first solution than in the second?

Answer and explanation

Correct answer: Ten thousand times

The governing relation is pH = −log₁₀[H⁺]. A decrease of one pH unit means a tenfold increase in hydrogen-ion concentration. The difference between pH 2 and pH 6 is 6 − 2 = 4 units, so the ratio is 10⁴ = 10,000. Equivalently, [H⁺] at pH 2 is 10⁻² mol/L and at pH 6 is 10⁻⁶ mol/L; their ratio is 10⁴. Therefore option A is correct.

Related tags

Ph CalculationHydrogen Ion ConcentrationLogarithmic ScaleAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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