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A student measures the pH of four solutions: 2, 6, 7, and 11. Which solution will have the highest hydroxide ion concentration?

Answer and explanation

Correct answer: Solution with pH 11

At 25°C, pH and pOH are related by pH + pOH = 14, and hydroxide concentration increases as pOH decreases. For pH 11, pOH is 3, so [OH⁻] is about 10⁻³ mol L⁻¹. The pH 7 solution is neutral, while pH 6 and pH 2 are acidic and have much lower hydroxide concentrations. Hence the pH 11 solution has the highest [OH⁻].

Related tags

Ph-ScaleHydroxide-IonsAcid-Base-StrengthAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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