Answers 26-27 CFISD TX-Chemistry A CR Properties of Acids and BasesQuestion 7

7

AssignmentMultiple Choice

Properties of Acids and Bases

Question 7 • *26-27 CFISD TX-Chemistry A CR

A beaker contains a solution of calcium hydroxide (Ca(OH)2) in water. A student places a straw in the beaker and then breathes into the solution through the straw. As the student breathes into the solution, a white precipitate forms. What is the most likely composition of the precipitate?H2OCaCO3CH3OH

Answer

A

H2O

B

CaCO3

C

CH3OH

Explanation

Exhaled air contains carbon dioxide, which reacts with calcium hydroxide: Ca(OH)2 + CO2 → CaCO3 + H2O. Calcium carbonate (CaCO3) is insoluble in water and forms the white precipitate, so the precipitate is calcium carbonate.

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