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A student adds water to an acidic solution and observes that the pH changes from 2 to 4. What is the most correct meaning of this change?

Answer and explanation

Correct answer: The solution became less acidic

For an aqueous solution, pH = −log[H⁺]. Adding water dilutes the solution, lowering the hydrogen-ion concentration and increasing its pH from 2 to 4. Because pH 4 is still below 7, the solution remains acidic, but it is less acidic than before. It has not necessarily become basic, and dilution does not remove all ions. Thus A is the most accurate statement.

Related tags

PhDilutionHydrogen IonsAcid-Base ScaleAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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