. Hydroxylamine : its quantitative determination and some double salts . v^ring an excess over the amount to crystallizewith anJhydrouB copper sulphate to form CuSQ^.6NHgOH, the green solu-tion (obtained by allowing the alcoholic hydroxylamine to stand overanhydrous copper sulphate) was filtered and allowed to crystallizein a quiet room at a temperature below fifteen degrees. The crys-tals came down very slov/ly, some taking two weeks or over. Theyare very easily decomposed as soon as brought into the air, so thatgreat care and haste has to be taken in successfully getting thecrystals out of t
. Hydroxylamine : its quantitative determination and some double salts . v^ring an excess over the amount to crystallizewith anJhydrouB copper sulphate to form CuSQ^.6NHgOH, the green solu-tion (obtained by allowing the alcoholic hydroxylamine to stand overanhydrous copper sulphate) was filtered and allowed to crystallizein a quiet room at a temperature below fifteen degrees. The crys-tals came down very slov/ly, some taking two weeks or over. Theyare very easily decomposed as soon as brought into the air, so thatgreat care and haste has to be taken in successfully getting thecrystals out of the solution, dried, and the hydroxylamine determinedbefore the crystals decompose. The copper crystals were beautifulgreen, transparent crystals, but in decomposing they left a whitepowder in every way similar to the anhydrous salt used to start with. It was found that the crystals came down sooner from a moresaturated solution, gotten by allowing the hydroxylamine solution tostand over the anhydrous copper sulphate for several days, then fil-tering and -17- v/ere The cryBtals taken frcn the soluti ordried on filter paper and aporous plate and poured into a weighed tube. The portions for anal-ysis were weiglied by difference and the work done as rapidly aspossible. The hydroxylamine being determined by Stahlers method--Add an excess of titanium solution and titrate the excess withstandard permanganate. Care must be taken to allow time for titani-um and hydroxylamine to act else the reaction will bo betv/een hydrox-ylamine and permanganate which is far from quantitative. + The copper in the crystals was determined electrolytically accord- thc ing tr^method of Smith. The solution is placed in a clean weighedplatinum dish and acidified with a few drops of nitric acid, andthen electrolysed with a current of .09 amphere and 1,9 volts forfour to five hours. At the end of that time the liquid is tested tosee if copper is all precipitated. If so, the acid solution is si
Size: 1324px × 1886px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidhydroxy, booksubjecttheses
