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A substance dissolves in water, turns red litmus blue, and gives carbon dioxide with acid. Which substance could it be?

Answer and explanation

Correct answer: Sodium carbonate

The governing concept is the identification of a basic carbonate salt by two tests. Turning red litmus blue shows that the aqueous solution is basic. Releasing carbon dioxide on adding an acid is characteristic of a carbonate or hydrogen carbonate: CO₃²⁻ + 2H⁺ → CO₂ + H₂O. Sodium carbonate dissolves in water, gives an alkaline solution through hydrolysis, and produces carbon dioxide with acids. Thus option B fits both observations; sodium chloride is neutral, while ammonium chloride and copper sulfate do not give this combination.

Related tags

Sodium CarbonateBasic SaltCarbonate TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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