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Chapter 4: Problem 87

Oxygen \(\left(\mathrm{O}_{2}\right)\) and carbon dioxide \(\left(\mathrm{CO}_{2}\right)\) are colorless and odorless gases. Suggest two chemical tests that would enable you to distinguish between them.

Short Answer

Expert verified
Two distinguishing tests could be: 1) Using a glowing splint, where in the presence of oxygen, the splint will burst into flames, while in the presence of carbon dioxide, it would be extinguished. 2) Using limewater, where if carbon dioxide is passed through it, the limewater turns milky due to the formation of calcium carbonate. Oxygen does not react with limewater.

Step by step solution

01

Distinguishing the gases

1. Testing with a glowing splint: Oxygen is a supporter of combustion. So, in the presence of oxygen, a glowing splint bursts into flame. On the other hand, carbon dioxide doesn't support combustion so a glowing splint would extinguish in the presence of \(CO_2\).2. Testing with limewater:Another distinguishing test between \(O_2\) and \(CO_2\) is the use of limewater (\(Ca(OH)_2\)). When carbon dioxide passes through limewater, it turns milky due to the formation of insoluble calcium carbonate (\(CaCO_3\)). This does not happen with oxygen since oxygen does not react with limewater.

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