Potassium Bromide

Potassium Bromide BP P Eur Grade Specifications

DEFINITIONContent98.0 per cent to 100.5 per cent (dried substance).

CHARACTERSAppearanceWhite or almost white, crystaler or colourless crystals.SolubilityFreely soluble in water and in glycerol, slightly soluble in alcohol.

IDENTIFICATIONA. It gives reaction of bromides.B. Solution S (see Tests) gives the reactions of potassium.

TESTSSolution SDissolve 10.0 g in carbon dioxide-free water R prepared from distilled water R and dilute to 100 ml with the same solvent.Appearance of solutionSolution S is clear and colourless.Acidity or alkalinityTo 10 ml of solution S add 0.1 ml of bromothymol blue solution R1. Not more than 0.5 ml of 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the colour of the indicator.BromatesTo 10 ml of solution S add 1 ml of starch solution R, 0.1 ml of a 100 g/l solution of potassium iodide and 0.25 ml of 0.5 M sulric acid and allow to stand protected from light for 5 min. No blue or violet colour develops.ChloridesMaximum 0.6 per cent.IodidesTo 5 ml of solution S add 0.15 ml of ferric chloride solution and 2 ml of methylene chloride.Shake and allow to separate. The lower layer is colourless.SultesMaximum 100 ppm.IronMaximum 20 ppm.Magnesium and alkah metalsMaximum 200 ppm, calculated as Ca.Heavy metalsMaximum 10 ppm.Loss on dryingMaximum 1.0 per cent, determined on 1.000 g by drying in an oven at 105C for 3h.