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An unknown salt solution shows pH 8.5 and turns red litmus blue. What type of salt is it most likely to be?

Answer and explanation

Correct answer: Salt of weak acid and strong base

The governing concept is the relation between salt hydrolysis and the strengths of its parent acid and base. A pH of 8.5 is above 7, and red litmus turning blue confirms that the solution is basic. Salts formed from a weak acid and a strong base, such as sodium carbonate in the usual school-level classification, generally hydrolyse to produce a basic solution. Hence option B is correct; strong-acid/weak-base salts are usually acidic, while strong-acid/strong-base salts are approximately neutral.

Related tags

Basic SaltPhLitmusAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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