Question

how do you confirm the formation of co2 gas

Answer 1

Carbon dioxide (CO2) is colorless and odorless, so you can't detect it through direct observation. You'll need to collect an air sample (or a CO2 sample), then run one of several simple tests to identify the presence of the gas. You can bubble the gas through limewater, or you can hold a lit splint into the sample to see if it is extinguished by the presence of CO2.

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Answer 2

pass the gas through lime water it will turn the lime water milky!!!!