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The pH of an acidic solution changes from 3 to 6. What happens to acidity?

Answer and explanation

Correct answer: It decreases one thousand times

The governing concept is the logarithmic pH scale, defined as pH = −log[H+]. A rise of one pH unit means a tenfold decrease in hydrogen-ion concentration. The change from pH 3 to pH 6 is three units, so acidity decreases by 10 × 10 × 10 = 1000 times. Thus option A is correct. Option B treats pH as an ordinary linear scale, while C and D reverse or ignore the change.

Related tags

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

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