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The temperature rises slightly when sodium hydroxide is added to an acidic solution. What is the reason?

Answer and explanation

Correct answer: Neutralisation releases heat

When sodium hydroxide is added to an acid, hydroxide ions combine with hydrogen ions to form water: H+ + OH- -> H2O. This acid-base process is neutralisation, and the formation of water is generally exothermic, so some energy is released as heat and the temperature rises. The sodium hydroxide does not simply become a gas, the acid does not become a metal, and salt formation does not freeze water. Thus option A is correct.

Related tags

NeutralisationHeatAcid BaseAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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