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On heating baking soda, the remaining solid solution turns red litmus blue. What is the identity of the remaining solid?

Answer and explanation

Correct answer: Sodium carbonate

Baking soda is sodium hydrogen carbonate, NaHCO₃. On heating, it decomposes according to 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O. The solid residue is therefore sodium carbonate, Na₂CO₃. Its aqueous solution is basic because carbonate ions hydrolyse water to produce hydroxide ions, so it turns red litmus blue. Sodium chloride is neutral, while the other choices do not match this decomposition.

Related tags

Baking SodaSodium CarbonateThermal DecompositionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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