Sodium Benzoat BP

Sodium benzoate BP Grade

British Pharmacopoeia
C7H5NaO2
Sodium benzenecarboxylate
Content
99.0 per cent to 100.5 per cent (dried substance).
CHARACTERS
Appearance
White or almost white, crystalline or granular powder or flakes, slightly hygroscopic.
Solubility
Freely soluble in water, sparingly soluble in ethanol (90 per cent V/V).
IDENTIFICATION
A. It gives reactions of benzoates.
B. It gives reaction of sodium.
TESTS
Solution S
Dissolve 10.0 g in carbon dioxide-free water and dilute to 100 ml with the same solvent.
Appearance of solution
Solution S is clear and not more intensely coloured than reference solution.
Acidity or alkalinity
To 10 ml of solution S add 10 ml of carbon dioxide-free water and 0.2 ml of phenolphthalein solution. Not more than 0.2 ml of 0.1 M sodium hydroxide or 0.1 M hydrochloric acid is required to change the colour of the indicator.
Halogenated compounds
Maximum 200 ppm for ionized chlorine and maximum 300 ppm for total chlorine.