MOLECULAR FORMULA :- H3BO3
MOLECULAR WEIGHT :- 61.83
|Description||White, Crystalline powder or colorless shiny plates, unctuous to the touch or white crystals, odorless||White or almost white, crystalline powder, colorless, shiny plates greasy to the touch, or white or almost white crystals.||White or almost white, crystalline powder, colorless, shiny plates greasy to the touch, or white or almost white crystals.|
|Solubility||–||Soluble in water and in ethanol (96 %), freely soluble in boiling water and in glycerol ( 85 %).||–|
|Appearance of solution
(10% w/v solution)
|3.5 % w/v solution in boiling water is clear and colorless.||3.3 % w/v solution is clear and color less.||–|
(A) By color
|A: The flame has a green border.
B: 3.3 %w/v the solution is faintly acid.
|A: The flame has green border.
B: 3.3 % w/v solution is acidic.
|It responds to the tests for borate|
|Ph ( 3.3 % w/v solution)||3.8-4.8||3.8 – 4.8||–|
|Solubility in ethanol
|The solution is not more opalescent than opalescence standard OS2 and colorless||The solution has not more opalescent than reference suspension II and colorless.||–|
|Organic matter||–||It does not darken on progressive heating to dull redness||–|
|Sulphates||NMT 450 ppm||NMT 450 ppm||–|
|Arsenic||NMT 10 ppm||–||–|
|Heavy metal||NMT 20 ppm||–||NMT 20 ppm|
|Loss on drying||NMT 0.5 %||–||NMT 0.5 %|
|Residual solvents||Meets the requirements|
|Assay||99.5 % to 100.5 % ( on dry basis)||99.0 % – 100.5 %||99.5 % to 100.5% (on dry basis )|