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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    is dissolved, must either bc free from acids or mustpre- viously be exactly neutralized by means of N/10 alkali. Phenolphthalein, methyl orange, rosolic acid, cur- cumin, or litmus, are usually employed as indicators, the first two more frequently than the others. If the liquid is dark colored the use of “ alkali blue ” is often convenient, and attention must always be paid to the possible presence of carbonic anhydride. The be- haviour of various acids, hydroxy acids, phenols, and their Substitution products with helianthin, phenol- phthalin, and Poirrier’s blue has been studied.1 A somewhat curious and interesting attempt has been made to determine the neutrality by taste.2 Certain lactones can be titrated with alkali although they are insoluble in sodium hydrogen carbonate.3 a- Dibenzoylsuccinic lactone may be easily titrated, in alcoholic solution, with N alkali by the use of phenol phthale'in.4 Hydroresorcinol behaves in a similar manner.5 (C) Esterification. In very many cases carboxylic and phenolic hydrogen may be differentiated by the esterification of the com- pound with alcohol and hydrogen chloride. It has, however, been shown6 that acids with the group 1 H. Imbert and A. Astruc, C. r. 130 (1900), 35. Journ. Cliem. Soc. 78 (19c«), i. 226. 2 T. W. Richards. Am. Chem. Journ., 20, 125. 3 H. L. Fulda, M. 20 (1899), 700. 4 L. Knorr, Ann. 293 (1897), 87. 5 R. v. Schelling, Ibid. 308 (1899), 185. 6 V. Meyer and others. Many papers appeared on the subject beginning B. 27, 510, and ending 29, 2569.