116 FINE CHEMICALS AND PHARMACEUTICS. . [IV. 



strong bottle, adding 7 grm. of crystallized citric acid, and 

 corking quickly and firmly. Flavor may be imparted by 

 means of different syrups. 



Gliromic Acid. — Traube recommends the following method 

 of preparing chromic acid. (An. der Ch. u. Phar. Ixvi.) To 

 heat gently 1 pt. bichromate of potassa, 2J pts. water, and 

 3| pts. sulphuric acid, decant the liquid from the sulphate of 

 potassa which separates on cooling, and add 4 pts. more of 

 sulphuric acid when the acid begins to separate. The liquid 

 is heated, water being added to dissolve the crystals, then 

 evaporated until a pellicle forms, and set aside to crystallize. 

 The acid, dried on brick or biscuit-ware, may be purified by 

 carefully fusing it, when sulphuric acid and bichromate of 

 potassa form an insoluble salt of oxide of chrome ; or by re- 

 solution in water, adding oil of vitriol until a precipitate ap- 

 pears, evaporation and slow crystallization. 



Qxide of Antimony. — Hornung (Journ. de Pharm. 1848) 

 gives the following economical process (a modification of Fre- 

 derking's) for preparing the oxide of antimony to be used in 

 the manufacture of tartar emetic. Mix together in an iron 

 vessel 15 pts. finely-powdered sulphuret of antimony and 

 36 pts. sulphuric acid, expose to a gentle heat for 12 to 18 

 hours, and stir frequently. The mixture thickens at first, but 

 afterwards liquefies upon an increase of the temperature, and 

 finally becomes white ; sulphur fuses and separates, and sul- 

 phurous acid fumes are disengaged. The heat and stirring 

 are continued as long as these phenomena continue. When 

 the vapor or gas evolved consists only of sulphuric acid, water 

 is to be gradually added, and the mass washed for the removal 

 of free sulphuric acid. The subsulphate of antimony is to be 

 decomposed, with carbonate of soda, and the resulting oxide 

 of antimony washed. 13 pts. dry greenish-white oxide, soluble 

 in tartaric acid, are thus obtained from 15 pts. sulphuret of 

 antimony. 



Sulphantimoniate of Sodium. — Van der Corput prepares 

 this (Schlippe's) salt by intimately mixing together, in powder, 

 8 pts. efiloresced sulphate of soda, 6 pts. sulphuret of an- 



