Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Murexide> ?p ?o. }
Showing items 1 to 67 of
67
with 100 items per page.
- Murexide abstract "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. W.N. Hartley found considerable difficulty in obtaining specimens of murexide sufficiently pure to give concordant results when examined by means of their absorption spectra, and consequently devised a new method of preparation for murexide. In this process alloxantin is dissolved in a large excess of boiling absolute alcohol, and dry ammonia gas is passed into the solution for about three hours. The solution is then filtered from the precipitated murexide, which is washed with absolute alcohol and dried. The salt obtained in this way is in the anhydrous state. It may also be prepared by digesting alloxan with alcoholic 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. In solution, its color ranges from yellow in strong acidic pH through reddish-purple in weakly acidic solutions to blue-purple in alkaline solutions. The pH for titration of calcium is 11.3.Justus von Liebig and Friedrich Wöhler 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.Murexide is presently used[citation needed] 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. Due to the minute amounts needed for this purpose, it is often used in a 1:250 mixture with potassium sulfate.[citation needed]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 and 1.2 ppm, and the maximum absorbance wavelength is 506 nm.[citation needed]Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants.[citation needed]".
- Murexide iupacName "Ammonium 2,6-dioxo-5-[(2,4,6-trioxo-5-hexahydropyrimidinylidene)amino]-3H-pyrimidin-4-olate".
- Murexide thumbnail Murexide.png?width=300.
- Murexide wikiPageID "3140632".
- Murexide wikiPageRevisionID "602183712".
- Murexide hasPhotoCollection Murexide.
- Murexide imagefile "Murexide.png".
- Murexide imagesize "230".
- Murexide iupacname "Ammonium 2,6-dioxo-5-[amino]-3H-pyrimidin-4-olate".
- Murexide verifiedrevid "447621203".
- Murexide subject Category:Ammonium_compounds.
- Murexide subject Category:Complexometric_indicators.
- Murexide subject Category:Dyes.
- Murexide type Abstraction100002137.
- Murexide type AmmoniumCompounds.
- Murexide type Cognition100023271.
- Murexide type ColoringMaterial114984973.
- Murexide type Communication100033020.
- Murexide type ComplexometricIndicators.
- Murexide type Compound105870180.
- Murexide type Concept105835747.
- Murexide type Content105809192.
- Murexide type Dye114985383.
- Murexide type Dyes.
- Murexide type Fact106636259.
- Murexide type Idea105833840.
- Murexide type Index106639674.
- Murexide type Information106634376.
- Murexide type Material114580897.
- Murexide type Matter100020827.
- Murexide type Message106598915.
- Murexide type Part113809207.
- Murexide type PhysicalEntity100001930.
- Murexide type PsychologicalFeature100023100.
- Murexide type Relation100031921.
- Murexide type Substance100019613.
- Murexide type Whole105869584.
- Murexide type ChemicalCompound.
- Murexide type ChemicalSubstance.
- Murexide type ChemicalSubstanceType.
- Murexide type ChemicalObject.
- Murexide type Thing.
- Murexide comment "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. W.N. Hartley found considerable difficulty in obtaining specimens of murexide sufficiently pure to give concordant results when examined by means of their absorption spectra, and consequently devised a new method of preparation for murexide.".
- Murexide label "Mureksyd".
- Murexide label "Murexid".
- Murexide label "Murexida".
- Murexide label "Murexide".
- Murexide label "Murexide".
- Murexide label "Murexide".
- Murexide label "Murexide".
- Murexide label "Мурексид".
- Murexide label "紫脲酸铵".
- Murexide sameAs Murexid.
- Murexide sameAs Murexid.
- Murexide sameAs Murexida.
- Murexide sameAs Murexide.
- Murexide sameAs Murexide.
- Murexide sameAs Murexide.
- Murexide sameAs Mureksyd.
- Murexide sameAs Murexida.
- Murexide sameAs m.08t_nc.
- Murexide sameAs Q414825.
- Murexide sameAs Q414825.
- Murexide sameAs Murexide.
- Murexide wasDerivedFrom Murexide?oldid=602183712.
- Murexide depiction Murexide.png.
- Murexide isPrimaryTopicOf Murexide.