Mureksyd – organiczny związek chemiczny, sól amonowa kwasu purpurowego, wykorzystywany w chemii analitycznej jako wskaźnik w miareczkowaniu kompleksometrycznym i fotometrycznym do oznaczania jonów wapnia i innych metali. Jony metali, które mogą być oznaczane za pomocą mureksydu: metody kompleksometryczne: Ag, Ca, Co, Cu, Mn, Ni, Sc, Th i Zn metody fotometryczne: Ca, Cu i Sc↑ ↑ ↑ ↑ ↑ ↑

PropertyValue
dbpedia-owl: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]
  • Murexid patří spolu s xylenovou modří, eriochromovou černí a pyrokatechinovou violetí do skupiny metalochromních indikátorů.Jedná se o amonnou sůl kyseliny purpurové C8H5N5O6, ve volném stavu neznámé. Murexid, který má vzorec C8H5N5O6. NH4 + H2O, vzniká různými pochody z dusíkatých látek, příslušných do skupin kyseliny močové (více zde). Tento indikátor se používá ke stanovení mědi, niklu, kobaltu při pH 8 až 9 (barevný přechod ze žlutooranžové do červenofialové) a vápníku při pH 12 (z červené do modrofialové).
  • A murexida (ou purpurato de amônio, sal de amônio do ácido purpúrico), (NH4C8H4N5O6, ou C8H5N5O6.NH3), é um indicador para análise de metais em compleximetria.A temperatura ambiente se apresenta como um sólido marrom escuro inodoro, levemente solúvel em água, e visto que em solução este indicador é instável, é utilizado em mistura sólida pulverizada com cloreto de sódio. A viragem é assinalada pela troca da cor de vermelho, para a forma ligada ao metal, na titulação, para o violeta. Sua coloração em solução também varia com o pH do amarelo em fortes solução ácidas passando por púrpura-avermelhado em fracas soluções ácidas a azul-púrpura em soluções alcalinas.
  • Mureksyd – organiczny związek chemiczny, sól amonowa kwasu purpurowego, wykorzystywany w chemii analitycznej jako wskaźnik w miareczkowaniu kompleksometrycznym i fotometrycznym do oznaczania jonów wapnia i innych metali. Jony metali, które mogą być oznaczane za pomocą mureksydu: metody kompleksometryczne: Ag, Ca, Co, Cu, Mn, Ni, Sc, Th i Zn metody fotometryczne: Ca, Cu i Sc↑ ↑ ↑ ↑ ↑ ↑
  • La murexide (o muresside o porporato d'ammonio) è un sale d'ammonio dell'acido purpurico molto noto come indicatore metallocromico.A temperatura ambiente si presenta come un solido marrone scuro inodore e, dato che in soluzione questo indicatore non è stabile, viene utilizzato in miscela solida polverizzata con cloruro di sodio. La murexide anidra è di colore viola rossastra. Il viraggio è segnalato dal cambiamento di colore dal rosso, nella forma legata al metallo oggetto della titolazione, al violetto.
  • Мурексид (MX) - органический краситель, пурпурат аммония, аммиачная соль 5,5'-нитрилодибарбитуровой (пурпуровой) кислоты. Брутто-формула С8Н8N6O6*H2O (расширенно: NH4C8H4N5O6, или C8H5N5O6.NH3). Имеет пурпурно-красный цвет.
  • Murexide is het ammoniumzout van purperzuur. Het wordt gebruikt om complexen te vormen met calcium en zo te dienen als indicator.
  • Vorlage:Infobox Chemikalie/Summenformelsuche vorhandenMurexid (saures Ammoniumsalz der im freien Zustand nicht existierenden Purpursäure C8H5N5O6) ist ein Indikator zur Titration von Metallen. Murexid ist darüber hinaus das Endprodukt der Murexid-Reaktion, einer chemischen Nachweisreaktion für Harnsäure, Xanthin und verwandte Substanzen.
dbpedia-owl:alternativeName
  • purpurate d'ammonium, MX,
dbpedia-owl:casNumber
  • (hydrate)
dbpedia-owl:iupacName
  • 2,6-dioxo-5-[(2,4,6-trioxo-5-hexahydropyrimidinylidène)amino]-3H-pyrimidin-4-olate d'ammonium
dbpedia-owl:smiles
  • [O-]\C2=C(/N=C1\C(=O)NC(=O)NC1=O)C(=O)NC(=O)N2.[NH4+]
dbpedia-owl:thumbnail
dbpedia-owl:wikiPageID
  • 6353937 (xsd:integer)
dbpedia-owl:wikiPageLength
  • 8186 (xsd:integer)
dbpedia-owl:wikiPageOutDegree
  • 44 (xsd:integer)
dbpedia-owl:wikiPageRevisionID
  • 92015980 (xsd:integer)
dbpedia-owl:wikiPageWikiLink
prop-fr:apparence
  • poudre rouge-violacée
prop-fr:c
  • 8 (xsd:integer)
prop-fr:fusion
  • >
prop-fr:h
  • 8 (xsd:integer)
prop-fr:logp
  • -3.970000 (xsd:double)
prop-fr:n
  • 6 (xsd:integer)
prop-fr:nomiupac
  • 2.600000 (xsd:double)
prop-fr:o
  • 6 (xsd:integer)
prop-fr:smiles
  • [O-]\C2=CCNCN2.[NH4+]
prop-fr:solubilite
  • faiblement soluble dans l'eau
  • insoluble dans l'éthanol et l'éther
prop-fr:stdinchi
  • 1 (xsd:integer)
prop-fr:stdinchikey
  • LJYRLGOJYKPILZ-UHFFFAOYSA-N
prop-fr:synonymes
  • purpurate d'ammonium, MX,
prop-fr:tailleimage
  • 200 (xsd:integer)
prop-fr:wikiPageUsesTemplate
dcterms:subject
rdf:type
rdfs:comment
  • Mureksyd – organiczny związek chemiczny, sól amonowa kwasu purpurowego, wykorzystywany w chemii analitycznej jako wskaźnik w miareczkowaniu kompleksometrycznym i fotometrycznym do oznaczania jonów wapnia i innych metali. Jony metali, które mogą być oznaczane za pomocą mureksydu: metody kompleksometryczne: Ag, Ca, Co, Cu, Mn, Ni, Sc, Th i Zn metody fotometryczne: Ca, Cu i Sc↑ ↑ ↑ ↑ ↑ ↑
  • Мурексид (MX) - органический краситель, пурпурат аммония, аммиачная соль 5,5'-нитрилодибарбитуровой (пурпуровой) кислоты. Брутто-формула С8Н8N6O6*H2O (расширенно: NH4C8H4N5O6, или C8H5N5O6.NH3). Имеет пурпурно-красный цвет.
  • Murexide is het ammoniumzout van purperzuur. Het wordt gebruikt om complexen te vormen met calcium en zo te dienen als indicator.
  • Vorlage:Infobox Chemikalie/Summenformelsuche vorhandenMurexid (saures Ammoniumsalz der im freien Zustand nicht existierenden Purpursäure C8H5N5O6) ist ein Indikator zur Titration von Metallen. Murexid ist darüber hinaus das Endprodukt der Murexid-Reaktion, einer chemischen Nachweisreaktion für Harnsäure, Xanthin und verwandte Substanzen.
  • A murexida (ou purpurato de amônio, sal de amônio do ácido purpúrico), (NH4C8H4N5O6, ou C8H5N5O6.NH3), é um indicador para análise de metais em compleximetria.A temperatura ambiente se apresenta como um sólido marrom escuro inodoro, levemente solúvel em água, e visto que em solução este indicador é instável, é utilizado em mistura sólida pulverizada com cloreto de sódio. A viragem é assinalada pela troca da cor de vermelho, para a forma ligada ao metal, na titulação, para o violeta.
  • La murexide (o muresside o porporato d'ammonio) è un sale d'ammonio dell'acido purpurico molto noto come indicatore metallocromico.A temperatura ambiente si presenta come un solido marrone scuro inodore e, dato che in soluzione questo indicatore non è stabile, viene utilizzato in miscela solida polverizzata con cloruro di sodio. La murexide anidra è di colore viola rossastra.
  • 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.
  • Murexid patří spolu s xylenovou modří, eriochromovou černí a pyrokatechinovou violetí do skupiny metalochromních indikátorů.Jedná se o amonnou sůl kyseliny purpurové C8H5N5O6, ve volném stavu neznámé. Murexid, který má vzorec C8H5N5O6. NH4 + H2O, vzniká různými pochody z dusíkatých látek, příslušných do skupin kyseliny močové (více zde).
rdfs:label
  • Murexide
  • Mureksyd
  • Murexid
  • Murexid
  • Murexida
  • Murexide
  • Murexide
  • Murexide
  • Мурексид
owl:sameAs
http://www.w3.org/ns/prov#wasDerivedFrom
foaf:depiction
foaf:isPrimaryTopicOf
is dbpedia-owl:wikiPageWikiLink of
is foaf:primaryTopic of