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The gas released on heating baking soda turns lime water milky. What is the identity of the gas?

Answer and explanation

Correct answer: Carbon dioxide

Baking soda is sodium hydrogen carbonate, NaHCO₃. On heating, it decomposes according to 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. The released carbon dioxide reacts with limewater, calcium hydroxide, to form insoluble calcium carbonate, making the solution milky: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Therefore option A is confirmed.

Related tags

Baking SodaCarbon DioxideLimewaterDecompositionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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