Question

How are you test Co2 gas

Answer 1

Answer:

pass it through lime water and it turns milky

Answer 2

How to Test for CO₂

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

1.Collect a CO2 sample. To begin your test, you will need a sealed test tube filled with collected gas. You can collect carbon dioxide in a gas jar, a boiling tube, or another airtight container. Collection is usually performed over water in a beaker. CO2 gas is denser than air, so you can collect it using "downward delivery" or a gas syringe.

2 Mix calcium carbonate with hydrochloric acid (HCl). The simplest way to collect carbon dioxide is to react calcium carbonate (or limestone chips) with hydrochloric acid. First, pour 20 mL of HCl into a conical flask. Add a spoonful of calcium carbonate (or limestone chips) to the HCL. When the reaction starts, cover the conical flask with a bung and delivery tube: you will collect the gas through the delivery tube and into an upturned test tube (which is immersed in bowl of water). If the water in the test tube is displaced, then gas is being collected.[1]

You can continue to collect the gas for as long as the reaction occurs.