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A solution has pH 3. If the hydrogen-ion concentration becomes one hundred times lower, what will be the approximate new pH?

Answer and explanation

Correct answer: Five

Use the definition pH = −log[H+]. If the hydrogen-ion concentration decreases by a factor of 100, that is a decrease of 10², so the pH increases by 2 units. Starting from pH 3, the new value is 3 + 2 = 5. Therefore option B is correct. A decrease in hydrogen-ion concentration cannot lower the pH to 1, while the other listed values imply a much larger change.

Related tags

Ph CalculationHydrogen IonsAcidityAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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