. Hydroxylamine : its quantitative determination and some double salts . romic sulphate were allowed to stand forsome time in a carbon dioxide atmosphere, the solution was heatedto boiling to drive off the oxides of nitrogen assiamed to be pres-ent because when the solution is not heated the reduction power isincreased very much. This metliod is simple yet accurate, decidedend point being brought out in the green chromate solution by thepermanganate. No. of Wt. Wt. KMnO^ Expt. taken found used 1 .0543 g .0530 g 2. .1785 g .1652 g 3 .0434 g .0409 g 4 .1045
. Hydroxylamine : its quantitative determination and some double salts . romic sulphate were allowed to stand forsome time in a carbon dioxide atmosphere, the solution was heatedto boiling to drive off the oxides of nitrogen assiamed to be pres-ent because when the solution is not heated the reduction power isincreased very much. This metliod is simple yet accurate, decidedend point being brought out in the green chromate solution by thepermanganate. No. of Wt. Wt. KMnO^ Expt. taken found used 1 .0543 g .0530 g 2. .1785 g .1652 g 3 .0434 g .0409 g 4 .1045 g .1036 g 5 .0776 g .0765 g 6 .0515 g .0506 g 1 KMnO^ = = .00113 + 20 = N^O + 3Hg069,5:16 = X :(No. , KMnO^ x factor)X = Wt. of + Simon*s volumetric method of determining hydroxyla-mine salts is by direct titration with potassium permanganate inneutral solution. The hydroxylamine , being oxidized2KMnO^ + 4 )NHg0H)g HgCgO^ = 2MnC204 + 2mC^04 + NgO + 3Ng+ 15 HgO + Oompt. rend. 135, 1339-42 140, 659-661140, 724-27. One molecule of permanganate oxidizes four molecules of hydroxyla-mine. In presence of oxalic acid, the acid is oxidized. The oxidatiorof the sulphate is as follows 4KMn04+ 5 j^)NH20H )2H2S0 J = 4MnS04 + K2SO4 + 2KNO2 + 2N2O + 2N2+2OH2OIf sulphuric acid is added, the nitrite is oxidized. The reducingpower is increased if the solution is but slightly acid. The accu-racy also depends upon the temperature and the rate of titration. Owing to the varying reducing effects of the acid withwhich the hydroxylamine is combined, better results are obtained ifan equivalent amount of sodium oxalate is added to the solution ofhydrochloride, nitrate or sulphate of hydroxylamine. Then the mix-ture behaves as if it were pure hydroxylamine oxalate and can betitrated exactly with permanganate. The results are not effected ifthere is an excess of oxalic acid. Slightly abnormal results areobtained when the quantity of sodium oxalate
Size: 1324px × 1886px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidhydroxy, booksubjecttheses
