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A basic solution changes from pH 14 to pH 11. Approximately how did its basicity change?

Answer and explanation

Correct answer: Decreased one thousand times

The pH scale is logarithmic, so a three-unit decrease corresponds to a factor of 10³ in hydrogen-ion concentration. For basicity, the relevant hydroxide-ion concentration changes oppositely: pH 14 corresponds to pOH 0, while pH 11 corresponds to pOH 3. Thus [OH⁻] falls from about 1 M to 10⁻³ M, a thousandfold decrease. The solution remains basic, but much less strongly basic; A is correct.

Related tags

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

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