Question

Name the compound used to test the evolution of carbon dioxide gas.

Answer 1

While performing chemical experiments we will be left with products after the desired reactions are carried out in the respective environments. We determine the results by observing the products obtained after the reaction is complete. For gases, we have to determine them using some of the characteristics of the gases. Like oxygen is a supporter of the combustion process, so anything in the presence of oxygen burns vigorously. Similarly, any gas can be identified by taking advantage of some of their characteristics.

Complete Step by Step answer
Carbon dioxide is a gas that is found as a trace gas in nature in relatively decent amounts, for it is a by-product of the respiration and combustion processes that occur around. It is a colourless gas that is odourless when in smaller concentration. While it is odourless and colourless under normal conditions the liquid form of carbon dioxide is not tasteless, it tastes more or less like soda water. It is similar to those carbonated drinks that are sold in bottles. In solid form. Carbon dioxide is called dry ice and can be used as a refrigerant.
Now if chemical reaction takes place and one of the by-products is a small amount of carbon dioxide then it is almost impossible to find the presence of carbon dioxide, however luckily you can find it using lime water. Limewater is the common name for calcium hydroxide $\left( {Ca{{\left( {OH} \right)}_2}} \right)$ . When you pass carbon dioxide gas formed through a calcium hydroxide solution, it reacts to form an insoluble suspension of Calcium carbonate $\left( {CaC{O_3}} \right)$ which is a milky white solution, thus indicating the presence of carbon dioxide.
$Ca{\left( {OH} \right)_2} + C{O_2}\xrightarrow{{}}CaC{O_3} + {H_2}O$ .

Note
If the carbon dioxide produced is of higher concentration than you can identify it using the odour or by introducing a fire in the environment which will be put out due to the presence of carbon dioxide. This is why carbon dioxide is used in fire extinguishers.