(1) First, put water in a small jar, then take a bigger container and fill it with water.
(2) Then put the small jar into the container, and constantly add saltpeter into the container.
The chemical name of saltpeter is calcium nitrate, which is a white bitter crystal with frost color.
(3) After saltpeter is dissolved in water, it will absorb a lot of heat, which will lower the surrounding temperature and form ice.
Extended data:
First, use saltpeter to make ice cubes. You can also put water in a small basin, then put the small basin in a big basin, and put saltpeter in a big basin.
Secondly, saltpeter can be reused by cooling crystallization or evaporation crystallization after it is dissolved in water.
Third, buy saltpeter and buy calcium nitrate directly. You can buy saltpeter in a chemical store or drugstore if it is sold in a chemical reagent store.
When chemically pure ammonium nitrate is used instead, the effect is more obvious.
Fourth, industrial use.
Nitrite is often used to make black powder, fuse, glass, matches and fireworks, and also used as fertilizer (potash fertilizer and nitrogen fertilizer) and laboratory analysis reagent. It can be prepared by reacting sodium nitrate solution with potassium chloride.
Medicinal value of verb (abbreviation of verb)
Nitrate is also called arsenic nitrate, bitter nitrate, flame nitrate, fire nitrate, frost, raw nitrate and Bedi Zhu Xuan.
Nitrite is also called flame nitrate and potassium nitrate. Colorless, white or gray crystal with glass luster. Can be used for preparing peacock green glaze. It can also be used as multicolor and colored pigments. One of the raw materials for making gunpowder.
In industry, it is the raw material for making matches, pyrotechnics, black powder, glass and food preservatives. Potassium nitrate can be directly produced through mining and enrichment in Chile and other places.
References:
People's Daily Online: How did the ancients spend their summer without air-conditioning fans?
References:
People's Daily Online: How did the ancient people spend the "hot" summer without air conditioning?
References:
Baidu encyclopedia: saltpeter