DRIED ALUM 167 



Alumen Exsicoatum. Dried Alum. Al^K^ (SO,), 

 (U. S. P.) 



Synmym.—A.\vimen ustum, B.P.; burnt alum, E.; alum 

 calcine (desseche brule), Fr.; gebrannter alaun, G. 



Derivation.— Kesbt 100 gm. of alum moderately until 

 aqueous vapor ceases to be disengaged, and tlie product is 

 reduced to 55 gm. 



Alumini Hydboxidum. Aluminum Hydroxide. Al2(OH)5 



(U. S. P.) 



Synonym. — Aluminum hydrate, hydrated alumina, E.; 

 alumine, Fr.; thonerdehydrat, reine thonerde, G. 



Derivation. — Alum, 100 Gm.; sodium carbonate, 100 Gm.; 

 water, a sufficient quantity. Mix hot, boiling solutions of 

 alum and sodium carbonate. Precipitate strained, washed, 

 and dried. 



Properties. — A white, light, amorphous powder ; odorless 

 and tasteless ; permanent in dry air ; insoluble in water or 

 alcohol. 



Dose. — Same as alum. 



Alumini Sulphas. Aluminum Sulphate. Alj^SOJi+lBH^O. 



(U. S. P.) 



Synonym. — Sulphate of aluminum, E.; sulphate d'alum- 

 ine, Fr.; schwefelsaure thonerde, G. 



Derivation. — Aluminum hydroxide [Al (0H)3] is dis- 

 solved in diluted sulphuric acid, and the solution is filtered 

 and evaporated to dryness. 



Properties. — A white, crystalline powder, without odor, 

 having a sweetish and afterwards astringent taste ; perma- 

 nent in the air ; soluble in 1.2 parts of water ; insoluble in 

 alcohol ; reaction acid. 



Dose. — Same as alum. 



Digitized by Microsoft® 



