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If a little base is added to an acidic solution and its pH changes from 3 to 4, what is the correct conclusion?

Answer and explanation

Correct answer: Acidity decreased but the solution is still acidic

The governing concepts are the pH scale and partial neutralisation. Both pH 3 and pH 4 are below 7, so the solution remains acidic. However, increasing pH by one unit means the hydrogen-ion concentration has fallen by a factor of ten: [H⁺] at pH 4 is one-tenth of that at pH 3. Therefore acidity decreased but did not disappear, making option A correct. It did not become a strong base.

Related tags

PhPartial NeutralisationAcidic SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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