Except where otherwise noted, data are given for materials in their (at 25 °C 77 °F, 100 kPa).N ( Y N?)Murexide (NH 4C 8H 4N 5O 6, or C 8H 5N 5O 6NH 3), also called ammonium purpurate or MX, is the of. It may be prepared by heating in to 100 °C, or by boiling uramil (5-aminobarbituric acid) with. Found considerable difficulty in obtaining specimens of murexide sufficiently pure to give concordant results when examined by means of their, and consequently devised a new method of preparation for murexide. In this process alloxantin is dissolved in a large excess of boiling, and dry ammonia gas is passed into the solution for about three hours. The solution is then filtered from the murexide, which is washed with absolute alcohol and dried. The salt obtained in this way is in the state. It may also be prepared by digesting with ammonia at about 78 °C; the purple solid so formed is easily soluble in water, and the solution produced is indistinguishable from one of murexide.Murexide in its dry state has the appearance of a reddish purple powder, slightly soluble in water.
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In solution, its color ranges from yellow in strong acidic through reddish-purple in weakly acidic solutions to blue-purple in alkaline solutions. The pH for titration of calcium is 11.3.History and in Giessen, Germany, had investigated the purple product, murexide, obtained from snake excrement in the 1830s, but this was not an abundant raw material, and a method of using it as a dyestuff was not established at that time. In the 1850s, French colorists and dye-producers, such as Depoully in Paris, succeeded in making murexide from abundant South American guano and of applying it to natural fibers. It was then widely adopted in Britain, France and Germany.Usage Murexide is used in as a for complexometric titrations, most often of ions, but also for, and metals. Due to the minute amounts needed for this purpose, it is often used in a 1:250 mixture with. Murexide is also used as a reagent for measurement of calcium and rare-earth metals; for calcium, the pH required is 11.3, detection range lies between 0.2 and 1.2, and the maximum absorbance wavelength is 506 nm. Murexide and are investigated as promising enhancers of destruction of.
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