explains the confirmation test for oxygen
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Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen. ... A hydrogen pop is much more violent, sometimes enough to completely extinguish the splint.
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take a fire near the evolved gas. if it splutter out, then oxygen is not there. if it keeps burning, o2 is present.
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