On the isolation of the missing sulphur urea / by J. Emerson Reynolds.

Date:
[1869]
Catalogue details

Licence: Public Domain Mark

Credit: On the isolation of the missing sulphur urea / by J. Emerson Reynolds. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    III. -5374 grm. was cautiously fused with crystallised hydrate of barium, and small fragments of nitrate of ammonium added until no further action was produced; the mass was then digested with water, an excess of dilute nitric acid added, the solution filtered, and the chlorine determined in the filtrate; '4909 grm. of AgCl was obtained. A slight loss was unavoidable. •5045 grm. after ignition with soda-lime gave -9872 (NH4)2 PtClg. Calculated. Found. I. II. IIL Pt.... .. 197-0 43-15 43-18 42-94 — C13 .. .. 106-5 23-33 — — 22-62 S2.... .. 64-0 14-03 13-95 — — N, .. .. 56-0 12-26 — — 12-22 C2.... .. 24-0 5-26 — — — 11, .. 9-0 1-97 — — — 456-5 100-00 The analysis leads well to the formula (CS)H,N.2^ (CS)H,N2 Cl .PP^HCl, ClJ thus according in constitution with the equally well defined gold salt. If instead of adding a nearly neutral solution of tetrachloride of platinum to an e.xcess of the sulphur urea in aqueous solution, we add the latter to an excess of platiiiic chloride containing free hydrochloric acid, we get but little if any precipitate till after the lapse of some time; then a dirty brown precipitate gradually deposits, which is freed from excess ofplatinic chloride with difficulty. A specimen so prepared, washed until incipient decomposition was observed, and then dried, gave 52-38 per cent, of metallic platinum. The formula