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A solution has pH 2 and is diluted to become one hundred times less acidic. What will be the approximate new pH?

Answer and explanation

Correct answer: Four

The governing relation is pH = −log[H+]. A tenfold decrease in hydrogen-ion concentration increases pH by one unit. Becoming one hundred times less acidic means the hydrogen-ion concentration falls by 100 = 10², so the pH rises by two units. Starting from pH 2, the approximate new pH is 2 + 2 = 4. Dilution does not make the solution strongly basic, so six and eight are unsuitable.

Related tags

PhDilutionHydrogen IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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