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What change occurs in lime water to identify carbon dioxide?

Answer and explanation

Correct answer: It turns milky

Lime water is a clear solution of calcium hydroxide, Ca(OH)₂. When carbon dioxide is bubbled through it, the reaction forms insoluble calcium carbonate: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. The suspended calcium carbonate particles make the solution appear milky, so option A is correct. Blue, black, or pink colour changes are not the standard observation for this carbon dioxide test.

Related tags

Carbon DioxideLime WaterGas TestCalcium CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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