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If a solution changes from pH 4 to pH 7, what happens to hydrogen ion concentration?

Answer and explanation

Correct answer: It decreases one thousand times

The pH relationship is pH = −log[H⁺], so every increase of one pH unit represents a tenfold decrease in hydrogen-ion concentration. The change from pH 4 to pH 7 is three units; therefore the concentration changes by 10³ = 1000 in the decreasing direction. Hence option A is correct, not B, which treats the pH difference as an ordinary multiplier.

Related tags

Ph ScaleHydrogen IonsLogarithmic ChangeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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