XXXV.—Mercury hyponitrites

P. C. Rây
1897 Journal of the Chemical Society Transactions  
PRELIMINARY NOTICE. IT has been shown elsewhere* that mercurous nitrite, on prolonged contact with a large bulk of water, partially dissociates into mercury and mercuric nitrite, but that nearly 22 per cent. of the salt dissolves ccs such. W e have thus a neutral solution containing both mercurous and mercuric nitrite. It occurred to me' that, if this solution were treated according to the method of Divers,? the discoverer of hyponitrites, it might be possible to obtain the corresponding
more » ... orresponding mercury compounds. Memm-ozcs Hyponitrite. Divers reduced sodium nitrite by means of sodium amalgam, neutralised the solution with acetic acid, and finally added silver nitrate to it. This method, however, proved to be a failure in the present case. Instead of mercurous hyponitrite, as was expected, there was an almost immediate grey, and even blackish, deposit of metallic mercury. The explanation of the reduction in this case is probably to be looked for in the formation of hydroxylamine simultaneously with the hyponitrite. It thus became necessary to find a method of preparing sodium hyponitrite to the exclusion of this reducing agent. On consulting the literature on this subject, I came across Zorn's method as improved by Dunstan and Dymond (Trans., 1887, 51, 646). I found that the sodium hyponitrite prepared by their method is quite free from hydroxylamine ; and, although a trace of ferric hydroxide, probably in a colloidal form, passes through the filter paper, imparting to the liquid a slight brown colour, it is completely precipitated and the solution becomes perfectly clear on allowing it to stand overnight. Pmpratiom. -To the solution containing mercurous and mercuric nitrite, sodium hyponitrite solution in a highly diluted form is cautiously added drop by drop ; a copious, flocculent, yellow precipitate *
doi:10.1039/ct8977100348 fatcat:f3ndv4vkqnbffjhfxc7o2s465y