ammonium. 0*7780

2010-12-4 14:19:32 1404

0 本帖最后由 eehome 于 2013-1-5 10:05 编辑 times New="New" Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">colour, was poured off, and there was added to it an alcoholic solution of acetate of lead, which produced a cream* See Memoirs of the Moncler , Moncler jacket, Moncler K2 vest black, Moncler K2 vest Pink Manchester Literary and Philosophical Society, vol. xiv. p. 183. coloured precipitate. Having, as I supposed, added sufficient acetate of lead to precipitate about one half of the matter in solution, I filtered the liquid from the precipitate (6), and then added more of the lead solution, which produced a precipitate of a pu Moncler jackets, Moncler Multiple K2 Vest Beige re cream-colour (c). This was filtered off, washed with alcohol, dried in vacuo, and submitted to analysis. It contained, like many of the lead compounds subsequently analyzed, chloride of lead, which had to be estimated. By attempting to remove all the hydrochloric acid from the solution of extractive matter before precipitation, I ran the risk of producing decomposition in the organic substance. I. 1-0895 grm. of this compound, burnt with o Moncler jackets for men, Moncler Alpin, Moncler Angers, Moncler Bady xide of copper and oxygen, gave 0-7765 grm. carbonic acid and 02175 grm. water. 1-1580 grm., burnt with soda-lime, gave 0-1355 grm. chloride of platinum and ammonium. 07780 grm. gave 0-6240 grm. sulphate of lead. 0-9190 grm. dissolved in nitric acid gave with nitrate of silver 0-079~jgrm. chloride of silver, equivalent to 0-0772 grm. chloride of lead. These numbers lead to the following composition:— C 19-43 H 2-21 N 0-73 0 16-97 PbO 5226 PbCl 8-40 10000 After deducting the oxide and chloride of lead, and calcula Moncler Branson Jacket ，Moncler Branson Navy , Moncler Bea ting the composition in 100 parts of the organic substance combined with them, this composition will be found to correspond with the formula Coa Uax) NO4a, which requires Calculation. Experiment. , *- , C? 372 49-93 49-39 H? 39 5-23 5-61 N 14 1-87 1-85 O4a 320 42-97 J3!15, 745 100-00 100-00 No importance is to be attached to this formula, which is merely an empirical ex Moncler down jackets, Moncler Multiple K2 Vest Black pression for the composition of the substance, or mixture of substances, prepared in the manner described. As a guide to further experiments, the analysis was, however, not without use. The very small proportion of nitrogen obtained showed that the substance was probably free from the urinary constituents containing much of that element, and that the lead compound contained extractive matter only ; but whether the latter consisted of on Moncler jackets women, Moncler Boutique ly one substance or of several was doubtful, as the method of preparation afforded no guarantee for its purity. The lead precipitate (6), which, it was to be presumed, had the same composition as the one analyzed, was now examined. It was suspended 0
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