. Hydroxylamine : its quantitative determination and some double salts . 145248. -1- Hydroxylamine, NHrjOH Is forraed by the action of nas-cent hydrogen upon nitric acid, the oxides of nitrogen or the ni-trates . HN0,^+3H2=NHg0H+SH202N0+3Hp=2NH^0H The nascont hydrogen is evolved from tin and hydrochloric acid and astream of nitric oxide passed through the niixturo. The hydroxylaminethus forraed is purified by passing hydrogen sulphide through thesolution. The tin is precipitated as the sulphide and removed byfiltration. The filtered solution is then evaporated to dryness andthe hydrochloride o
. Hydroxylamine : its quantitative determination and some double salts . 145248. -1- Hydroxylamine, NHrjOH Is forraed by the action of nas-cent hydrogen upon nitric acid, the oxides of nitrogen or the ni-trates . HN0,^+3H2=NHg0H+SH202N0+3Hp=2NH^0H The nascont hydrogen is evolved from tin and hydrochloric acid and astream of nitric oxide passed through the niixturo. The hydroxylaminethus forraed is purified by passing hydrogen sulphide through thesolution. The tin is precipitated as the sulphide and removed byfiltration. The filtered solution is then evaporated to dryness andthe hydrochloride of hydroxylamine is dissolved out of theresidue by means of absolute alcohol. The latter is distilled offand the residue is converted into the sulphate by treating with sul-phuric acid, Hydroxylamine is also prepared by boiling potassiumhydroxylamine disulphonate with water,2N(0H) (SOj^K)g +4HgO=(NHgOH)2S04+SH2S04+KgS04 The potassium sulphate is removed by crystallization. The hydroxyla-mine can be obtained in solution from the sulphate by the addition ofbarium hydrohydroxylamineits00grid
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