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A student takes equal amounts of two acids. The first ionises completely and the second ionises partially. Which is more likely to have a lower pH?

Answer and explanation

Correct answer: The first acid

For equal amounts and comparable concentrations, pH depends on the hydrogen-ion concentration, according to pH = −log[H⁺]. Complete ionisation releases a greater proportion of hydrogen ions than partial ionisation, so the first acid is more likely to have the larger [H⁺] and therefore the lower pH. Option A is correct. The second acid would generally have a higher pH, while neither acid is necessarily neutral.

Related tags

Strong AcidIonisationPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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