Sep. 14, 2020
Nitric acid is made by the reaction of nitrogen dioxide with water. Normally, the nitric oxide produced by the reaction is re-oxidized by the oxygen in air to produce additional nitrogen dioxide. Adding sulfuric acid to a nitrate salt and heating the mixture with an oil bath can make almost pure nitric acid.
Aug. 31, 2020
We learned from the formaldehyde supplier that formaldehyde (HCHO) is a colorless, strong pungent odor gas, easily soluble in water, alcohol ethers, and has been identified by the World Health Organization as a carcinogenic and teratogenic substance. It is recognized The source of allergies is also one of the potential strong mutagens.