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Which is the most suitable sequence to confirm the presence of carbonate ions in a sample?

Answer and explanation

Correct answer: Add dilute acid and pass the gas into lime water

The governing test for carbonate ions uses acidification followed by limewater confirmation. A carbonate reacts with a dilute acid to release carbon dioxide: CO₃²⁻ + 2H⁺ → CO₂ + H₂O. Passing this gas into limewater produces calcium carbonate, making it milky. Smelling, magnet testing, or dry litmus cannot confirm carbonate ions, so A is correct.

Related tags

Carbonate TestLimewaterCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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