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Which of the following salts is formed by the neutralisation of a strong acid and a strong base and generally has a neutral aqueous solution?

Answer and explanation

Correct answer: NaCl

Direct answer: A, NaCl, is correct. Neutralisation is the reaction in which an acid reacts with a base to form salt and water. In this case, hydrochloric acid is a strong acid and sodium hydroxide is a strong base: HCl + NaOH → NaCl + H₂O. When NaCl dissolves, it produces Na⁺ and Cl⁻ ions. Neither ion undergoes significant hydrolysis in ordinary aqueous conditions, so the solution is generally neutral and has a pH close to 7. Option B, NH₄Cl, is not the expected neutral salt here because NH₄⁺ comes from the weak base ammonia and makes the solution generally acidic. Option C, Na₂CO₃, gives a basic solution because carbonate is the conjugate base of a weak acid. Option D, CH₃COONa, gives a basic solution because acetate is the conjugate base of weak acetic acid. Do not judge only by the word “salt”; identify the acid and base that produced it and consider hydrolysis. Memory cue: strong + strong → usually neutral.

Related tags

Acids Bases SaltsNeutralisationSalt HydrolysisNaclAqueous SolutionPhAcidsBasesAnd SaltsAcids Bases And Salts

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