Sodium Salicylate Ip/Bp/Usp

Formula

C₇H₅O₃Na   
(M.W. 160.10)

Chemical Name

Sodium Salt of Salicylic Acid.

Technical Information

White odourless crystals, scales or powder; becomes pinkish on long exposure to light.
Aqueous solution slightly acidic, pH between 5-6.

Description

Flakes-Colourless, Crystalline flakes.
Powder-White powder.

Odour

Odourless or with a faint characteristic odour.

Reaction

A 10% w/v solution in water is neutral or acid to litmus.

Acidity

2.0 gm. dissolved in 50 ml of CO₂ free water requires not more than 0.2 ml of 0.1 N NaOH solution to produce a red colour.
(indicator-10 drops of phenol red)

Clarity & Colour of Solution

Passes Test

Organic Volatile Impurities

Passes Test

Arsenic

2 ppm (max)

Heavy Metals

20 ppm (max)

Chloride

200 ppm (max)

Sulphate

600 ppm (max)

Sulphite or Thiosulphate

1 g of Sodium Salicylate dissolved in 20 ml of water and acidified with 1 ml of conc. HCl,
the filtrate does not require more than 0.15 ml of 0.1 N Iodine Solution.

Loss on drying

0.5 % (max) when dried at 105⁰ C

Assay

99.0% to 101% I.P/B.P., 99.5% to 100.5% U.S.P of C₇H₅O₃Na calculated with reference to substance dried at 105 ⁰C.