Borax
Molecular Formula:Na2B4O7.10H2O Molecular Weight:381.38g/mol CAS NO.:1303-96-4
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Specification
Characters
It appears as a white, crystalline powder, colorless crystals or crystalline masses, efflorescent
IdentificationTest (A)Test (B)
Test(C)
(a) Specified test. The flame has a green border(b)The solution is red. On addition of 5ml of glycerol, the color disappears.
(c) Solution S gives the reaction of sodium
Solubility
It is soluble in water, very soluble in boiling water, freely soluble in glycerol
Appearance of solution
The solution is clear and colorless.
pH
Between 9.0 to 9.6
Sulfates
Not more than 50 ppm
Ammonium
Not more than 10 ppm
Arsenic
Not more than 5 ppm
Calcium
Not more than 100 ppm
Assay
Not less than 99.0% and not more than 103.0% of Na2B4O7.10H2O