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A dilute acid is added to a white solid, producing a gas that turns lime water milky. What could the white solid be?

Answer and explanation

Correct answer: Calcium carbonate

The governing qualitative test is that carbon dioxide turns limewater milky by forming insoluble calcium carbonate: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Acids react with carbonates to release carbon dioxide, so white calcium carbonate can produce this observation. Option A is therefore correct. Sodium chloride and copper sulphate do not normally release CO₂ with dilute acid, while sodium hydroxide neutralises acid instead of giving this gas.

Related tags

CarbonateCarbon Dioxide TestQualitative AnalysisAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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