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A student says carbonates give hydrogen with acids. What is the correct correction?

Answer and explanation

Correct answer: Carbonates give carbon dioxide with acids

The governing reaction pattern is acid plus carbonate producing salt, water and carbon dioxide: carbonate + acid → salt + H₂O + CO₂. For example, sodium carbonate reacting with hydrochloric acid releases CO₂, not hydrogen. The gas can turn limewater milky, providing a useful confirmation. Hydrogen is associated with many acid–active-metal reactions, so option A correctly fixes the student’s misconception; B, C and D do not fit the reaction.

Related tags

CarbonateAcid ReactionCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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