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If a solution has pH 3 and it is made one hundred times less acidic, what will be the approximate new pH?

Answer and explanation

Correct answer: Five

The pH scale is logarithmic: pH = −log[H⁺]. A tenfold decrease in hydrogen-ion concentration raises pH by one unit. Making the solution 100 times, or 10² times, less acidic means [H⁺] becomes 100 times smaller, so the pH rises by log₁₀(100) = 2 units. Starting from pH 3, the approximate new pH is 3 + 2 = 5. Therefore option C is correct.

Related tags

Ph CalculationAcidityLogarithmic ScaleHydrogen IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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