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A substance gives carbon dioxide with acid and forms a basic solution in water. Which substance is most suitable?

Answer and explanation

Correct answer: Sodium carbonate

Evolution of carbon dioxide when an acid is added is a characteristic test for a carbonate or hydrogencarbonate. Sodium carbonate reacts with an acid, for example: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. In water, Na₂CO₃ undergoes hydrolysis and produces a basic solution because carbonate ions react with water to form hydroxide ions. Ammonium chloride is acidic, sodium chloride is nearly neutral, and copper sulphate is not the required carbonate. Thus option C is correct.

Related tags

Sodium CarbonateCarbonateBasic SaltAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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