When air is blown from the mouth into a test-tube containing limewater, the limewater turns milky due to the presence of $C O_{2}$ . What is the component formed as a product of the reaction that turns the solution milky?

Oxygen

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Carbon dioxide

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Nitrogen

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Water vapour

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Solution

The correct option is B
Carbon dioxide

Calcium hydroxide $(C a (O H)_{2})$ is commonly known as limewater. When it reacts with carbon dioxide $(C O_{2})$ , calcium carbonate $(C a C O_{3})$ is formed which is insoluble and turns the solution milky. This is a confirmatory test for the presence of carbon dioxide.

Equation: $C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

When we blow air from our mouth into a test tube containing limewater, it turns milky, indicating that we exhale out $C O_{2}$ .

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When air is blown from the mouth into a test-tube containing limewater, the limewater turns milky due to the presence of CO2. What is the component formed as a product of the reaction that turns the solution milky?

When air is blown from the mouth into a test-tube containing limewater, the limewater turns milky due to the presence of $C O_{2}$ . What is the component formed as a product of the reaction that turns the solution milky?