Chemical: Rice vinegar and acetic acid (acetic acid, glacial acetic acid, glacial acetic acid)

Molecular structure of acetic acid

In "Chemistry: What to Do If You Get Bitten by an Ant?" (toutiao.com)" in the article, ants will spit formic acid, also called formic acid. This is an organic acid, the simplest of organic acids. Is there formic acid, is there acetic acid? Yes. The picture above is the molecular structure of acetic acid, which is composed of two carbon atoms C, two oxygen atoms O, and four hydrogen atoms H. A carbon atom has four valence electrons. The two carbon atoms each form a covalent bond with one valence electron, and each carbon atom has three valence electrons left. One of them, with three hydrogen atoms, runs out of valence electrons (the hydrogen atom has only one valence electron), for a total of four covalent bonds. The other connects two oxygen atoms, one oxygen atom is a double bond connection, the other oxygen atom is a valence electron connected to a carbon atom, and the other valence electron is connected to a hydrogen atom. There are also four covalent bonds. The chemical formula is CH3COOH. Formic acid is composed of one carbon atom C, two oxygen atoms O, and two hydrogen atoms H. This A and B are named by carbon atoms. Acetic acid has two carbon atoms, and formic acid has only one carbon atom.

Pure acetic acid, at an atmospheric pressure, the freezing point is 16.6 ° C. Therefore, it is a colorless transparent solid like ice at room temperature, so pure acetic acid is also called glacial acetic acid. There is a very strong vinegar taste.

The rice vinegar we dip in when we eat dumplings and seafood is generally composed of 97% water and 3% acetic acid. Chemists first extracted acetic acid from rice vinegar, so acetic acid is also called acetic acid (or glacial acetic acid).

Acetic acid can be used not only for condiments, but also for skin diseases such as eczema. Find a little glacial acid, dilute to less than 10%, and apply to the affected area. If the condition is mild, white vinegar is also available. If eczema is severe, the concentration can be increased a little, but it will be very painful, and even peel off the skin at once. If the skin is peeled, it will be just once.

You can also cure a cold, smell the high concentration of acetic acid, and the symptoms are gone. I went to Shanxi, got a serious cold on Mount Wutai, came down and went directly to visit a veteran vinegar workshop, and when I came out, I would be fine.