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If equal volumes of an acid and a base are mixed but the pH does not become 7, what could be a possible reason?

Answer and explanation

Correct answer: Their concentration or strength was not the same

Equal volume does not mean equal chemical amount. Neutralisation depends on the number of reacting H⁺ and OH⁻ ions, which is determined by concentration and acid or base strength. For example, equal volumes of 0.1 M HCl and 0.1 M NaOH can approach pH 7, but unequal concentrations or a weak reactant can leave an excess of one ion. Therefore A is correct.

Related tags

NeutralisationConcentrationPhAcid-Base StrengthAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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