During the carbonate test, the gas turns limewater cloudy. What gas caused this change?

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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

During the carbonate test, the gas turns limewater cloudy. What gas caused this change?

Explanation:
Cloudiness in limewater points to carbon dioxide. Limewater is a solution of calcium hydroxide. When CO2 is bubbled through it, the gas dissolves in the water and reacts with calcium hydroxide to form calcium carbonate, which is insoluble. The solid disperses as a milky suspension, making the solution appear cloudy. This is the classic test for carbon dioxide: the gas turns limewater cloudy. Hydrogen and oxygen don’t react to form a precipitate with limewater, and chlorine doesn’t produce this milky change in this context, so carbon dioxide is the gas responsible.

Cloudiness in limewater points to carbon dioxide. Limewater is a solution of calcium hydroxide. When CO2 is bubbled through it, the gas dissolves in the water and reacts with calcium hydroxide to form calcium carbonate, which is insoluble. The solid disperses as a milky suspension, making the solution appear cloudy. This is the classic test for carbon dioxide: the gas turns limewater cloudy. Hydrogen and oxygen don’t react to form a precipitate with limewater, and chlorine doesn’t produce this milky change in this context, so carbon dioxide is the gas responsible.

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