4223. Sulphate of Ammonia

4223.      Sulphate of Ammonia. The commercial sulphate is obtained by saturating with weak oil of vitriol the ammoniacal liquor of the gas-works, or bone-spirit. For medicinal purposes it is prepared by saturating dilute sulphuric acid with sesquicarbonate of ammonia in slight excess; it is then filtered, evaporated by a gentle heat, and crystallized.

4224. Murexide

4224.    Murexide. This is the purpurate of ammonia, and consists of iridescent crystals, which reflect a beautiful green color, but transmit an equally fine reddish-purple color. It is obtained from alloxan, a substance formed by the action of nitric acid on uric acid.

4225. Iodide of Ammonium

4225.    Iodide of Ammonium.. Place a portion of iodine in a flask with a little water ; add to it a solution of hydrosulphuret of ammonia, until the mixture loses its red color, and is turbid from the separation of sulphur; by shaking the flask, the most of the sulphur will form into a mass. Pour off the liquid, and boil it until all odor of sulphuretted hydrogen and of ammonia is lost, Then filter it, and evaporate it, constantly stirring, over a flame, until it becomes pasty, and then in a water-bath until it forms a dry salt. (U. S. Bis.)

4226. Sulphocyanide of Ammonium

4226.    Sulphocyanide of Ammonium. Saturate 2 parts of common water of ammonia (specific gravity 0.950) with sulphuretted hydrogen; and add (5 parts of the same ammonia. To this mixture add 2 parts of sulphur, and the product of the distillation of 6 parts of prussiate of potash, 3 of sulphuric acid, and 18 of water. Digest till the sulphur is no longer acted on, and the liquid becomes yellow. Boil the liquid till it becomes color-less, filter, evaporate, and crystallize.

4227. Bromide of Ammonium

4227.    Bromide of Ammonium. For the preparation of bromide of ammonium, bromine is added very gradually to diluted ammonia. The ensuing reaction produces much heat, which may cause ammonia and bromine to volatilize with the escaping nitrogen. The combination, therefore, is effected in a Wolffe's apparatus, which will condense and retain both perfectly. The evaporation of the fluid is also best done in an iron retort connected with a stoneware receiver, in which ammonia and some bromide of ammonium are condensed.

4228. Sulphuret of Ammonium

4228. Sulphuret of Ammonium. Usually called hydrosulphuret of ammonia. This is prepared from strong liquor of ammonia, by saturating it with sulphuretted hydrogen gas, and then adding a second portion of liquor of ammonia, equal in strength and quantity to that first used. Keep it in well-stoppered bottles. (See No. 1203 (Hydrosulphate or Hydro-sulphuret of Ammonia).)

4229. Manganate of Baryta

4229.     Manganate of Baryta. The manganate of baryta, and of other alkalies, is formed by igniting the nitrate of the alkalies with peroxide of manganese, with excess of air, and dissolving in water. (Booth.)