There are mainly two ways by which we can find the taste of co2. (1) is that when we pass co2 gas through freshly prepared lime water than it turns it milky, and the (2)is that it put\’s off any burning fuel.
A lighted wooden splint goes out in a test tube of carbon dioxide but this happens with other gases, too. It is better to bubble the test gas through limewater – calcium hydroxide solution. Carbon dioxide turns limewater cloudy white.