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An acid is added to a white solid and a gas evolves that turns lime water milky. Excess of the same gas removes the milkiness. What is the final soluble substance?

Answer and explanation

Correct answer: Calcium hydrogen carbonate

The governing concept is the reaction of carbon dioxide with limewater. The gas turns limewater milky because insoluble calcium carbonate forms: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. When CO₂ is passed in excess, the precipitate reacts further: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂. Calcium hydrogen carbonate is soluble, so the milkiness disappears. Therefore option C is correct; calcium carbonate is only the intermediate product.

Related tags

Lime WaterCarbon DioxideCarbonate TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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