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Why can milky lime water become clear again when excess carbon dioxide is passed?

Answer and explanation

Correct answer: Because soluble calcium hydrogen carbonate is formed

Initially, carbon dioxide reacts with limewater to form insoluble calcium carbonate, which causes the milky appearance: CO2 + Ca(OH)2 → CaCO3 + H2O. When excess CO2 is passed, the calcium carbonate reacts further with carbon dioxide and water to form soluble calcium hydrogen carbonate, Ca(HCO3)2. The solid precipitate dissolves, so the solution becomes clear again; option D is correct.

Related tags

Lime-WaterExcess-Carbon-DioxideCalcium-Hydrogen-CarbonatePrecipitateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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