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An acidic solution changes from pH 3 to pH 6. Approximately how much did the acidity decrease?

Answer and explanation

Correct answer: Thousand times

The pH scale is logarithmic: pH = −log[H⁺]. A rise of one pH unit means the hydrogen-ion concentration, and therefore acidity, decreases by a factor of 10. The change from pH 3 to pH 6 is three units, so the decrease is 10 × 10 × 10 = 1000 times. Thus option A is correct; three, one hundred, and ten times do not match the three-unit logarithmic change.

Related tags

PhAcidityLogarithmic ScaleAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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