Which gas turns limewater cloudy?

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Prepare for the IGCSE Edexcel Chemistry Test with engaging flashcards and multiple-choice questions. Each question comes with detailed hints and explanations to enhance your learning experience. Master your exam with confidence!

Multiple Choice

Which gas turns limewater cloudy?

Explanation:
Limewater is used to test for carbon dioxide. When carbon dioxide dissolves in the calcium hydroxide solution, it reacts to form calcium carbonate, a solid that does not dissolve and makes the solution go milky. The key reaction is CO2 + Ca(OH)2 → CaCO3(s) + H2O. This cloudiness is a distinct sign of carbon dioxide because the other gases—ammonia, oxygen, and hydrogen—do not react with limewater to form a precipitate, so the solution stays clear.

Limewater is used to test for carbon dioxide. When carbon dioxide dissolves in the calcium hydroxide solution, it reacts to form calcium carbonate, a solid that does not dissolve and makes the solution go milky. The key reaction is CO2 + Ca(OH)2 → CaCO3(s) + H2O. This cloudiness is a distinct sign of carbon dioxide because the other gases—ammonia, oxygen, and hydrogen—do not react with limewater to form a precipitate, so the solution stays clear.

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