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Two acids have the same concentration. The first has pH 2 and the second has pH 5. Which statement is correct?

Answer and explanation

Correct answer: The first acid is more ionised and shows a stronger acidic effect.

The governing concept is the pH scale: a lower pH means a greater hydrogen-ion concentration. At the same formal concentration, the solution with pH 2 has more H⁺ ions than the solution with pH 5, so it shows the stronger acidic effect and is more extensively ionised under the stated comparison. In fact, the difference of three pH units corresponds to about a thousandfold difference in hydrogen-ion concentration. Therefore A is correct.

Related tags

PhStrong AcidWeak AcidIonisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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