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A student added dilute acid to sodium carbonate and passed the gas into lime water. Milkiness appeared first and then disappeared on passing excess gas. What is the correct reason?

Answer and explanation

Correct answer: First calcium carbonate then soluble calcium hydrogen carbonate forms

The governing reactions are carbonate–acid reaction and the limewater test for carbon dioxide. Acid plus sodium carbonate releases CO2. Initially, CO2 reacts with limewater: CO2 + Ca(OH)2 → CaCO3↓ + H2O, and insoluble CaCO3 causes milkiness. With excess CO2, CaCO3 + CO2 + H2O → Ca(HCO3)2, which is soluble, so the milkiness disappears. Hence option A is correct.

Related tags

Carbon DioxideLimewater TestCarbonatesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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