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 these two gases.

Short Answer

Expert verified
Two tests that can distinguish oxygen from carbon dioxide: a burning splint rekindles in oxygen but extinguishes in carbon dioxide; and when bubbled through limewater, oxygen has no effect but carbon dioxide turns the solution milky.

Step by step solution

01

Test with Burning Splint

Burn a small piece of wood or use a burning splint and then place it in each gas. Oxygen supports combustion, thus the splint will rekindle in oxygen. On the other hand, carbon dioxide does not support combustion, the flame will be extinguished in carbon dioxide.
02

Test with Limewater

Dissolve calcium hydroxide in water to form limewater. Then bubble each gas through the limewater. Oxygen will have no effect, thus the limewater will remain unchanged. However, carbon dioxide will react to form calcium carbonate, making the solution turn milky.

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