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If a basic solution is diluted with water, in which direction will its pH move?

Answer and explanation

Correct answer: It will decrease toward 7

The governing concept is pH and dilution. A basic solution has a hydroxide-ion concentration greater than that of neutral water. Adding water increases volume without adding an equivalent amount of base, so the hydroxide-ion concentration decreases. Consequently, pOH decreases and pH moves downward toward 7, although the solution remains basic if it is not diluted infinitely. It does not become acidic immediately, so option A is correct.

Related tags

DilutionBasic SolutionPhHydroxide IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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