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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Adding sodium carbonate to a solution gives no gas, but adding acid to sodium carbonate gives gas. What does this indicate?

Answer and explanation

Correct answer: Sodium carbonate needs an acidic medium to release gas

Carbonate ions release carbon dioxide when they react with hydrogen ions supplied by an acid: carbonate plus acid produces a salt, water, and CO2. Merely adding sodium carbonate to a solution that is not acidic need not produce visible gas. Thus option A correctly identifies the need for an acidic reaction medium. The gas is carbon dioxide, not hydrogen; sodium carbonate is soluble and is an ionic salt rather than a metal.

Related tags

Carbonate ReactionAcid TestCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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  1. 1What type of substance turns blue litmus paper red?
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