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A solution has pH 4. When water is added to the same solution, in which direction is its pH likely to change?

Answer and explanation

Correct answer: Towards 7

A pH of 4 identifies the solution as acidic because it is below the neutral value of 7. Adding water dilutes the acid, so the hydrogen-ion concentration decreases and the acidity becomes weaker. Consequently, the pH rises toward 7, although it would not normally jump above 7 or instantly reach another extreme. Therefore option A is correct; options B and C point in the wrong direction, while option D ignores dilution.

Related tags

PhDilutionAcidic-SolutionHydrogen-IonsNeutralityAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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