Medicinal grade boric acid cas10043-35-3 uses

Medicinal grade boric acid cas10043-35-3 uses white crystalline powder or colorless phosphorus sheets with pearl luster or hexagonal tri-oblique crystals
.

Tasteless, slightly sour and bitter
taste.

The melting point is about 171°C
.

Soluble in water, alcohol, glycerin, ethers and essential oils, the aqueous solution is weakly acidic
.

The solubility of boric acid in water increases with the increase of temperature, and can volatilize with water vapor 0.
Imol/L aqueous solution has a pH of 5.
1
.

19 can be soluble in 18mL cold water, 4mL boiling water, 18mL cold alcohol, 6mL boiling alcohol or 4mL glycerol
.

Slippery in contact with skin, no change
in exposed air.

When heated to 100 ~ 105 °C, a molecule of water is lost and metaboronic acid is formed, and when it is heated for a long time at 104 ~ 160 °C, it is converted into pyroboric acid, and at higher temperatures, anhydrous is formed, and boric anhydride (B2 03)
is generated at 300 °C.

【Content determination】Take 0.
1g of this product, weigh it precisely, add 20% neutral mannitol solution (p-phenolphthalein indicator liquid is neutral) 25ml, dissolve at microtemperature, cool quickly, add 3 drops of phenolphthalein indicator solution, and titrate with sodium hydroxide titration solution (0.
1mol/L
).

Each 1 ml of sodium hydroxide titration solution (0.
1 mol/L) corresponds to 6.
183 mg of H3BO3
.

H3BO3 61.
83 [10043-35-3] This product is calculated as a dry product, containing H3BO3 not less than 99.
5%.


【Properties】This product is a colorless crystal with pearl luster or a white loose powder
.

This product dissolves in ethanol or water; Soluble
in boiling water or boiling ethanol.

【Identification】The identification reaction of borate in the aqueous solution of this product (General 0301).