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Why does the milkiness disappear when excess carbon dioxide is passed through lime water?

Answer and explanation

Correct answer: Soluble calcium hydrogen carbonate is formed

The governing concept is the two-stage reaction of carbon dioxide with limewater. Initially, CO₂ reacts with calcium hydroxide to form insoluble calcium carbonate, Ca(OH)₂ + CO₂ → CaCO₃ + H₂O, causing milkiness. When excess CO₂ is bubbled through, the precipitate reacts further: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂. Calcium hydrogen carbonate is soluble, so the precipitate dissolves and the solution becomes clear. Option A is correct.

Related tags

LimewaterExcess Carbon DioxideCalcium Hydrogen CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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