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Why does the container become hot when acid is dissolved in water?

Answer and explanation

Correct answer: Because heat is released

Dissolving or diluting a concentrated acid in water is generally exothermic: hydration of ions and other interactions release energy as heat. That released heat raises the temperature of the solution and may warm the container. Option A is correct. Heat is not completely removed, water does not become a metal, and the effect is not caused by acid simply stopping gas formation. For safety, acid should be added slowly to water while stirring.

Related tags

Acid-DilutionExothermicHeatSafetyClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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