Barium permanganate, decomposition

When m-acetamidophenylseleninic acid is oxidised by alkaline permanganate it yields m-acetamidophenylselenonic acid, isolated in the form of the tetrahydrated barium salt, which crystallises in colourless needles, double decomposition giving the sodium salt. The latter separates from water in colourless needles and from alcohol in prismatic needles. Treatment of the barium salt with sulphuric acid releases the free acid as a dihydrate, which melts and decomposes at 229° C, (corr.). The sodium salt separates from water in plates. 

EXPLOSION and FIRE CONCERNS a flammable liquid NFPA rating Health 2, Flammability 2, Reactivity 1 explosive reactions with barium peroxide, boric acid, hydrochloric acid + water, potassium permanganate incompatible with 2- amino ethanol, aniline, glycerol, hydrogen fluoride, permanganates, sodium hydroxide, sodium peroxide, sulfuric acid, water when heated to decomposition it emits toxic fumes such as acetic acid and carbon monoxide use carbon dioxide, dry chemical, water mist, or alcohol foam for firefighting purposes. 

Immediately after mineralization of the organic substance with the decomposition product of silver permanganate a rubber tube ending with a rubber ball (used, for example, for filling automatic burettes) is connected to the upper end of the tube and the gases are carefully expelled over a pure surface of a freshly filtered saturated barium hydroxide solution (- 1 ml in a micro test tube). If the sample contains carbon, ah easily observable turbidity of BaCOs occurs. 

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