Determination of radicles in carbon compounds / by Dr. H. Meyer. Authorized translation by J. Bishop Tingle.

  • Meyer, Hans (Hans Johannes Leopold), 1871-
Date:
1903
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Licence: In copyright

Credit: Determination of radicles in carbon compounds / by Dr. H. Meyer. Authorized translation by J. Bishop Tingle. Source: Wellcome Collection.

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    bonate solution (60 cc), and titrated with iodine in the usual manner. 1 part As203 = 0.5454 parts CI.H(.N2.1 To the above methods may be added the titratio7i of phenylhydrazine with hydrochloric acid ; rosolic acid or methyl-orange is used as indicator, and tolerably accurate results are obtained.2 DETERMINATION OF THE NITRO-GROUP (N02). (A) Titration Method.3 Organic nitro-compounds are reduced to amino- derivatives by the action of stannous Chloride, in presence of hydrochloric acid, in accordance with the equation R.N02+ 3SnCla + 6HCl->R.NH2 + 3SnCl4 + 2H20; the unchanged stannous Chloride is determined by titration, and, from the quantity which has reacted, the number of nitro-groups in the original compound may be ascertained. Solution of iodine, or of potas- sium permanganate, is employed for the titration—the latter when much colour is developed. The method is inapplicable to trinitrophenol or nitronaphthalene.4 1 H. Causse, Bull. 19 [3], (1898), 147. 2 Strache and Iritzer. 3 H. Limpricht, B. 11, 35; Spindler, Ann. 224, 288. * Jenssen, J pr. 78, 193. S. W. Young and R. E. Swain, J. Am. (1897), ig, 812-814. Journ. Chem. Soc. (1S98), 74, ii, 186. P. Alt- mann, J. pr. (1901) 63 [2], 370.