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A salt solution shows pH 9 and turns red litmus blue. From which type of acid and base could it be formed?

Answer and explanation

Correct answer: Weak acid and strong base

The governing concept is salt hydrolysis and the strength of the parent acid and base. A pH of 9 and the change of red litmus to blue show that the salt solution is basic. Salts formed from a weak acid and a strong base commonly give basic solutions because the conjugate base of the weak acid hydrolyses water and produces hydroxide ions. Therefore option B is correct. A strong acid-weak base salt is generally acidic, while a strong acid-strong base salt is approximately neutral.

Related tags

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

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