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In which condition will the concentration of hydrogen ions be highest?

Answer and explanation

Correct answer: Solution with pH 2

The governing relationship is pH = −log₁₀[H⁺]. Therefore, a lower pH corresponds to a greater hydrogen-ion concentration. A solution of pH 2 has [H⁺] = 10⁻² mol L⁻¹, while pH 5 has 10⁻⁵ mol L⁻¹; the former is 1000 times greater. pH 7 is neutral and pH 9 is basic with a much lower hydrogen-ion concentration. Hence A is correct.

Related tags

PhHydrogen-Ion ConcentrationLogarithmic ScaleAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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