Product name:Murexide
CAS:3051-09-0
Molecular Formula:C8H8N6O6
Formula Weight:284.19
Description:
Specification:25g
Murexide (NH4C8H4N5O6, or C8H5N5O6.NH3), also called ammonium purpurate or MX, is the ammonium salt of purpuric acid. It may be prepared by heating alloxantin in ammonia gas to 100°C, or by boiling uramil (5-aminobarbituric acid) with mercury oxide.
Murexide is used in analytical chemistry as a complexometric indicator for complexometric titrations, most often of calcium ions, but also for Cu, Ni, Co, Th and rare earth metals. Cf. Eriochrome Black T.
Murexide is also used as a colorimetric reagent for measurement of calcium and rare earth metals; for calcium, the pH required is 11.3, detection range lies between 0.2-1.2 ppm, and the maximum absorbance wavelength is 506 nm.