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The gas formed in an acid and metal carbonate reaction can make lime water clear again when passed in excess. What is the reason?

Answer and explanation

Correct answer: Soluble calcium hydrogen carbonate is formed

The governing reactions involve carbon dioxide and limewater. Initially, CO₂ reacts with calcium hydroxide to form insoluble calcium carbonate, producing a milky appearance: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. When excess CO₂ is passed, the precipitate reacts further to form soluble calcium hydrogen carbonate, Ca(HCO₃)₂. The precipitate dissolves, so option A is correct.

Related tags

Lime-WaterCarbon-DioxideCalcium-Hydrogen-CarbonateCarbonate-ReactionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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