How to identify the gases present.
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Place a damp red litmus paper over the mouth of the test tube. Did the litmus paper turn blue?
| NO
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Place a blue litmus paper over the mouth of the test tube. Did the litmus paper turn red?
| NO
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Did the gas bleach the litmus paper?
| YES
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The gas is chlorine.
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YES
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YES
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NO
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The gas is ammonia.
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Bubble the gas into limewater. Is there a white precipitate formed?
| NO
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The gas is sulfur dioxide.
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Place a light splint over the mouth of the test tube. Did the gas extinguish the flame with a 'pop' sound?
| NO
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Place a glowing splint over the mouth of the test tube. Did the gas re-ignite the splint?
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YES
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YES
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YES
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The gas is carbon dioxide.
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The gas is hydrogen.
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The gas is oxygen.
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