Chemical properties:
1. Boric acid is a colorless and transparent flake with pearl luster or fine particles, which is in contact with skin.
A sense of satiny.
Odorless, slightly sour and slightly sweet.
2. The specific gravity of boric acid is 1.435( 15℃), and its melting point is 185℃, which has no change when exposed to air. Heat to.
Dehydration at 65438 007.5℃ produces metaboric acid (HBO _ 2);
H3BO3→HBO2+H2O
When metaboric acid is reheated to 150 ~ 160℃, it loses water and becomes pyroboric acid (H2B4O
7):
4HBO2→H2B4O
7+H2O
3. Boric acid 1g is soluble in 4 ml of boiling water, 18 ml of alcohol and 4 ml of glycerol. Boron
The acidity is very weak, and the aqueous solution of 1: 50 is detected by litmus test paper, which shows a weak acid reaction.
be filled/suffused/brimming with
1. Metaboric acid and pyroboric acid are oxyacids of trivalent boron.