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When hydrochloric acid is slowly added to sodium hydroxide solution, how will the pH of the solution change?

Answer and explanation

Correct answer: pH will decrease and become about 7 near neutralisation

The governing concept is neutralisation and the logarithmic pH scale. Sodium hydroxide initially makes the solution basic, so its pH is above 7. As hydrochloric acid is added, hydrogen ions reduce the hydroxide concentration and the pH falls. At the equivalence point, equal reacting amounts of strong acid and strong base produce nearly neutral sodium chloride solution, with pH about 7. Therefore C is correct; A and D show the wrong trend.

Related tags

PhNeutralisationStrong Acid And BaseAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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