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A gas produced by adding dilute hydrochloric acid to sodium carbonate solution is passed through limewater. Why does limewater first turn milky and then become clear when excess gas is passed?

Answer and explanation

Correct answer: Calcium carbonate forms first and then calcium hydrogen carbonate forms

Hydrochloric acid reacts with sodium carbonate and releases carbon dioxide: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Initially, CO₂ reacts with limewater to form insoluble calcium carbonate, CaCO₃, which makes it milky. With excess CO₂, this precipitate reacts with water to form soluble calcium hydrogen carbonate, Ca(HCO₃)₂, so the solution clears. Thus A is correct.

Related tags

Carbon DioxideLimewaterCarbonatesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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