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In which direction does pH move when water is added to a basic solution?

Answer and explanation

Correct answer: It decreases toward 7

The governing concept is dilution of a base. When water is added, the concentration of hydroxide ions per unit volume decreases. Consequently, the solution becomes less strongly basic and its pH falls toward the neutral value 7. It need not become exactly 7 after a limited amount of water is added. Therefore option A is correct; dilution does not raise pH above 14, make it zero, or leave it invariably unchanged.

Related tags

DilutionBasePhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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