Home › Miscellaneous Chemicals › Sesquicarbonate of Ammonia

Sesquicarbonate of Ammonia

This is the commercial carbonate of ammonia, and is prepared as follows; Sal-ammoniac, or pure commercial sulphate of ammo- Known in commerce as Seignette's or Rochelle nia, and chalk, equal parts, both dry and in salt. Dissolve 12 ounces carbonate of soda powder. Mix and sublime from an iron pot, in 2 quarts boiling water; add gradually 16 into a long earthen or leaden receiver, well ounces bitartrate of potassa in fine powder. cooled. The receiver is usually fitted with a Strain, evaporate to a pellicle or crust (see No. moveable lead cover, secured by a water-joint, 9), and set it aside to crystallize. The mother and has an open lead pipe in the bottom, to liquor may be further evaporated for a second allow the liquid products of the distillation to supply of crystals. (Cooley.) The U. S. drain off into a second receiver. When made Pharmacopœia adopts the same method, but of the impure sulphate of ammonia, it must directs 5 pints of boiling water to be used. be re-sublimed in iron pots, furnished with