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Ammonium pyrosulphate

Ammonium pyrosulphate, (NH4)8S207.—Sulphur trioxide combines with ammonium sulphate with evolution of heat, yielding the pyrosulphate as an amorphous, translucent, deliquescent substance, rendered crystalline by fusing and allowing to solidify. Its melting-point is given as 138° C.13 The primary sulphate crystallizes from its solution.14... [Pg.225]

Ammonia is evolved here in the condensation process of melamine to melam whereas the respective ammonium salts are evolved in the case of the hydrobromide and nitrate. Reactions 9 and 9b show that ammonia should be neutralised by pyrosulphuric acid groups. In TG we have found that diammonium pyrosulphate eliminates ammonia above 350 C, with however complete decomposition ... [Pg.223]

Fusion with sodium fluoride-potassium pyrosulphate-concentrated sulphuric acid. Digestion with fuming sulphuric acid-ammonium sulphateconcentrated nitric acid. [Pg.401]

See other pages where Ammonium pyrosulphate is mentioned: [Pg.223]    [Pg.225]    [Pg.639]    [Pg.223]    [Pg.225]    [Pg.639]    [Pg.223]    [Pg.698]    [Pg.703]    [Pg.174]    [Pg.649]    [Pg.686]    [Pg.698]    [Pg.343]   
See also in sourсe #XX -- [ Pg.225 ]



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Pyrosulphate

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