. Hydroxylamine : its quantitative determination and some double salts . of cobalt are known, +the is in form of pink crystals, which decompose readilywith the formation of nitrous acid. When the crystals are heated the;rgive ammonia and ammonium is an unstable insol-uble substance, obtained by passing oxygen at a reduced pressureinto an alkaline solution of cobaltic chloride and free hydroxylamine ,Yellow crystals of are formed when the second compoundis suspended in alcohol and treated with alcoholic hydrochloric water or
. Hydroxylamine : its quantitative determination and some double salts . of cobalt are known, +the is in form of pink crystals, which decompose readilywith the formation of nitrous acid. When the crystals are heated the;rgive ammonia and ammonium is an unstable insol-uble substance, obtained by passing oxygen at a reduced pressureinto an alkaline solution of cobaltic chloride and free hydroxylamine ,Yellow crystals of are formed when the second compoundis suspended in alcohol and treated with alcoholic hydrochloric water or concentrated sulphuric acid dissolves these crys-tals without decomposition. An oxalate of the formulaCog(0204)3. I2NH3O is known. Copper forms compounds similar to the cobalt—, soluble in hot water, but not dissolved by oxidation of the crystals is accompanied by fomation of a stable,brown product. Manganese forms very stable salts-- MnCl2«2NH30, decompos-ing at 150-160? , a white powder, insoluble inwater. + Ber. 27, +Kohlschutter prepared the compounds—HO-Ca-ONHg from lime and hy-droxy lamine, a white powder and a strong reducing , a tungstate, giving thick crystalline , white needle-like crystals HP02(NH40)2, colorless needles, which when heated burn with a greenflame and evolve hydrogen phosphide. are (H2P02)2(^^^3^ )3^2> thin plates which melt at 86° and, easily solublein water at 90°. The first phosphorus salt is obtained from phosphoric acid, and thesecond from disodium phosphite, Metavanadic acid VO3H yields three crystalline products—VQ3H(NH 3O)3, VO 3H(NH3O)2(NH3)2, VO3H(NH3O)2(NH3)2The first two separate out in lemon yellow crystals, the third can-not be obtained in the pure state. The neodymium compound NbOgHCNHsO)^ is a white powderslightly soluble in water and explodes with a yellow flame whenheated* Uhlenhuth prepared the following compounds--NiS0^.6NH20H, red, qua
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