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Which salt solution is likely to have a pH greater than 7?

Answer and explanation

Correct answer: Sodium carbonate

A pH greater than 7 indicates a basic solution containing a greater effective concentration of hydroxide ions than hydrogen ions. Sodium carbonate is a salt of a strong base and a weak acid; carbonate ions hydrolyse in water and generate some OH⁻ ions, so its solution is basic. Sodium chloride is approximately neutral, ammonium chloride is acidic because of ammonium-ion hydrolysis, and pure water is approximately neutral at ordinary conditions. Thus sodium carbonate is the only suitable choice.

Related tags

Salt PhBasic SaltSodium CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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