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A sample is heated, gas is released, and the solution of the remaining solid is basic. If the sample was baking soda, what is the remaining solid?

Answer and explanation

Correct answer: Sodium carbonate

The governing concept is thermal decomposition of sodium hydrogen carbonate, commonly called baking soda. On heating, 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. The released carbon dioxide accounts for the gas, while the remaining sodium carbonate dissolves to give a basic solution because carbonate ions hydrolyse water and produce hydroxide ions. Thus option B is correct; the other substances are not the solid product of this decomposition.

Related tags

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

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