In the carbonate test, which gas is produced when acid is added?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

In the carbonate test, which gas is produced when acid is added?

Explanation:
When a carbonate reacts with an acid, the carbonate ion (CO3^2−) reacts with the hydrogen ions (H+) from the acid to form carbon dioxide gas and water. This CO2 is the gas you observe as effervescence in the carbonate test, and it can be detected further by limewater turning cloudy when CO2 is bubbled through it. The other gases listed don’t come from this reaction: hydrogen would come from acids reacting with metals, oxygen from different decomposition or oxidation reactions, and nitrogen from nitrates or other nitrogen-containing compounds, not carbonates.

When a carbonate reacts with an acid, the carbonate ion (CO3^2−) reacts with the hydrogen ions (H+) from the acid to form carbon dioxide gas and water. This CO2 is the gas you observe as effervescence in the carbonate test, and it can be detected further by limewater turning cloudy when CO2 is bubbled through it. The other gases listed don’t come from this reaction: hydrogen would come from acids reacting with metals, oxygen from different decomposition or oxidation reactions, and nitrogen from nitrates or other nitrogen-containing compounds, not carbonates.

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