This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ... Ibid., 32, 64 (1899). Ibid., 32, 806 (1899). Chem.-Ztg., 25, 792 (1901). reveal the presence of any carbon. If now an electrode with an iron deposit upon it is used as cathode in an ammonium-carbonate solution, or in an ammonium-oxalate solution from which all the iron has been removed by 12 hours electrolyzing, then ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ... Ibid., 32, 64 (1899). Ibid., 32, 806 (1899). Chem.-Ztg., 25, 792 (1901). reveal the presence of any carbon. If now an electrode with an iron deposit upon it is used as cathode in an ammonium-carbonate solution, or in an ammonium-oxalate solution from which all the iron has been removed by 12 hours electrolyzing, then the deposit will become strongly contaminated with carbon. Other experimenters have also obtained good results with the method. Thus Schudl, in using electrolytic iron for the standardization of a potassium-permanganate solution, found that the results obtained compared favorably with values obtained by other methods. A. Neuburger f obtained similar results. If to the oxalate solution such substances as tartaric acid or citric acid (E. F. Smith) are added, then the iron deposit is more likely to contain carbon. The solution in which the iron is to be determined may contain a ferrous or ferric salt. If a solution of a ferrous salt is treated with ammonium oxalate, there is produced a deep, yellowish-red precipitate of ferrous oxalate, soluble in an excess of the reagent to a yellowish-red solution of ammonium ferro-oxalate. Ferric salts are not precipitated but if the yellow solution of ferric chloride is treated with sufficient ammonium oxalate, a solution of ammonium ferri-oxalate results which has a light green color. It is interesting to note that the complex ferrous oxalate forms a yellow solution and the complex ferric oxalate a green one, whereas the. color of ferrous chloride is green and that of ferric chloride is yellow. If the solution of ammonium ferri-oxalate is subjected to electrolysis, first of all the corresponding ferrous salt is formed by reduction and the latter eventually gives a deposit of iron on the cathode; thus ...
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