What is the nature of carbon dioxide?

Its nature is that it has no color or taste at normal temperature, and a slightly sour gas. Under standard conditions, the density is higher than that of air. It is soluble in water and cannot be burned. Its chemical formula is CO2. Carbon dioxide can generally be produced by burning limestone at high temperature or by reacting limestone with dilute hydrochloric acid. It can neither burn nor support combustion. It can react with water to form carbonic acid, and react with alkali to form water and salt. CO is generated at high temperature with carbon, and CO is a toxic substance. CO2 is one of the components in the air and a common greenhouse gas.

How to make CO2 in the laboratory?

In the laboratory, CO2 can be produced by reacting marble or limestone with hydrochloric acid. During the reaction process, the gas needs to remove impurities and strictly control the air humidity, and the reaction needs to be carried out in a dry environment. When hydrochloric acid reacts, excess HCl gas will be volatilized, so it is necessary to put in saturated NaHCO3 solution to remove HCl in the gas. During the reaction, water vapor will be brought out when the gas overflows, so it is usually dried with a gas scrubber filled with concentrated sulfuric acid. Due to the nature of carbon dioxide, it will react with water, so the upward exhaust method is used.

What is the role of CO2?

1. Gas fertilizer: The photosynthesis of plants requires carbon dioxide as a raw material. In many farms, materials with carbon dioxide are also used to increase the yield of crops.

2. Fire extinguishing: The fire extinguisher made of CO2 can be used to extinguish the fire of some important items, because no matter will be left after extinguishing.

3. Industrial raw materials: Many chemical products need to use carbon dioxide as chemical raw materials, such as the more familiar calcium carbonate and sodium carbonate.