Product Name

: BORIC ACID

C.A.S. No.

: 10043-35-3

Molecular Formula

: H₃BO₃

Molecular Weight

: 61.83

SPECIFICATION

IP

BP

USP

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.

-

Identification

1. By color

2. Reaction

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

(96% )

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 )