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Carbon dioxide first makes lime water milky and then removes the milkiness in excess. Why does this happen?

Answer and explanation

Correct answer: First calcium carbonate and then soluble calcium hydrogen carbonate forms

The governing concept is the reaction of carbon dioxide with lime water, which is aqueous calcium hydroxide. At first, CO₂ reacts as Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. Insoluble calcium carbonate particles scatter light and make the solution milky. When excess CO₂ is passed, CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂. Calcium hydrogen carbonate is soluble, so the suspended solid disappears and the milkiness is removed. Therefore option A is correct; the other options describe unrelated products.

Related tags

Lime WaterCarbon DioxideCalcium CompoundsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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