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Why is the pH of an aqueous solution of common salt approximately 7?

Answer and explanation

Correct answer: Because it is a salt of a strong acid and a strong base

The governing concept is the nature of salts formed from strong acids and strong bases. Common salt is sodium chloride, produced by the reaction of hydrochloric acid, a strong acid, with sodium hydroxide, a strong base. NaCl does not appreciably hydrolyse in water, so its aqueous solution is nearly neutral and has pH close to 7 at ordinary conditions. Therefore option A is correct; the other choices contradict its composition or solubility.

Related tags

Common SaltNeutral SaltPhStrong AcidStrong BaseAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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