Question

Describe the steps to determine evolution of CO2 gas during a reaction in laboratory.

Answer 1

The most effective way to test for CO2 is to bubble the gas through "limewater", a diluted solution of calcium hydroxide (slaked lime). When you bubble carbon dioxide through the solution, it forms a solid precipitate of calcium carbonate – chalk or limestone. Calcium carbonate is insoluble in water.

Thus, if there is CO2 present in the sample, the limewater will turn milky, cloudy white.

Hope it helps:)

Answer 2

Its simplest answer

When any metal reacts with hydrogen carbonate are Bicarbonate then it evolutes carbon dioxide gas