Scheme for the Identification of Acetanilide, Phenacetine, Quinine Sulphate, Etc.

Abstract

ACETANILIDE, PHENACETINE, QUININE SULPHATE, ETC. 933 14.6225 grams of a mixture containing 7.6037 grams of acetic acid and 7.0188 grams of benzene were placed in the tube described above and a few centigrams of water were added successively, the mixture being exposed to the temperature of a mixture of ice and salt, i. <?., about -20°, after each addition of water.Not until 0.7226 gram of water had been added did there occur a separation into layers, which persisted even at o°, but disappeared a few degrees above. Nowj Duclaux was fully aware that the presence of water rendered it possible to cause layer formation even at temperatures above 11°, for he writes : "It is indeed not necessary to have recourse to cold to obtain the separation, and the state of unstable equilibrium in which these liquids are, can be destroyed by the addition of a third substance, as, for example, water."A single drop of water suffices to cause a mixture of 10 cubic By Walter C. Blasdale.