Physico-chemical analysis of systems with a main component acetylsalicylic acid in ethanol-water mixtures, part 2: on the existence of potassium and lithium hydrogen acetylsalicylates.
The systems acetylsalicylic acid -- potassium acetylsalicylate -- 50 wt. % ethanol -- water mixture and acetylsalicylic acid -- lithium acetylsalicylate -- 95 wt. % ethanol -- water mixture have been investigated at 15,0 degrees C. The solubility diagrams of the systems and the distribution of the components between the liquid and the crystal phases have been determined. It was established that the solutions of both systems yield hydrogen acetylsalicylates. Their crystallization fields were determined in the solubility diagrams. The hydrogen acetylsalicylates obtained were isolated as preparations under the conditions of the systems and were analyzed by chemical analysis, X-ray diffraction analysis and IR spectroscopy. These analyses are evidence of their definite composition--C9H8O4 . C9H7O4K and C9H8O4 . C9H7O4Li.
D001241:Aspirin / Q000032:analysis*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D000431:Ethanol; D008094:Lithium; D011188:Potassium; D012995:Solubility; D013816:Thermodynamics; D014961:X-Ray Diffraction
D000431:Ethanol; D008094:Lithium; D001241:Aspirin; D011188:Potassium