guan1dine (u as w)

[Eng., ., guan(in), Chem.: CH5N3. An organic amine, obtained by the action of pota ium chlorate and hydrochloric acid on guanin. CHNOHO+O3 = CH5N3+ CO2+C3H2N2O3, parabanic acid; by heating biuret and hydrochloric acid gas in a sealed tube to 170°; by the action of alcoholic ammonia on chloropicrin at 100, C(NO2) Cl3+7NH3 = CH5N3+3NH3 HCl+ NH3 HNO3; also by the action of aqueous ammonia on ethyl ortho carbonate at 150°, C(OC2H5)4+3NH3= CH5N3+4C2H5OH; by heating ammonium chloride with cyanamide in an alcoholic solution to 100°, NH4C1-CN-NH2=CH3N2 HCl. Guanidine is best obtained by preparing the sulphate from the carbonate, and then removing the sulphuric acid by baryta water. Guanidine forms colorle deliquescent crystals, which are very soluble in alcohol and in water. The solution absorbs carbonic acid from the air. When guanidine is boiled with baryta water, it is converted into ammonia and urea. By the action of concentrated acids on alkalies, it is decomposed into CO2 and NH3. guanidine-carbonate, s. Chem.: 2CH3 H2CO3. Obtained by boiling, 100 parts of guanidine-sulphocyanate with fifty-eight parts of K2CO3, di olved in a very small quantity of water. The carbonate is then precipitated by alcohol, and recrystallized out of boiling water. guanidine-nitrate, s. Chem.: CH5N3 HNO3. Obtained by boiling guanidine-sulphocyanate with ammonium nitrate, and concentrating the solution, when guanidine-nitrate, which is only slightly soluble in cold water, crystallizes out in large plates.