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

Answer and explanation

Correct answer: Soluble calcium hydrogen carbonate forms

Initially, carbon dioxide reacts with limewater, calcium hydroxide, to form insoluble calcium carbonate: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. The suspended CaCO₃ causes milkiness. When excess CO₂ is passed, the precipitate reacts further with water and carbon dioxide to form soluble calcium hydrogen carbonate: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂. The solid dissolves, so the milkiness disappears and 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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