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If a basic solution has pH 13, in which direction will it change when water is added?

Answer and explanation

Correct answer: pH will decrease towards 7

The governing concept is dilution. A basic solution has pH above 7 because its hydroxide-ion concentration exceeds its hydrogen-ion concentration. Adding water lowers the concentration of hydroxide ions, so the solution becomes less basic and its pH moves downward toward 7. It does not instantly become acidic; therefore, option B is correct.

Related tags

PhBasic-SolutionDilutionHydroxide-IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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