Orthotellursure

TELLURIC ACID Struktur
7803-68-1
CAS-Nr.
7803-68-1
Bezeichnung:
Orthotellursure
Englisch Name:
TELLURIC ACID
Synonyma:
telluric;tellurate;TELLURIC ACID;Tellurium Acid;telluric(vi)acid;orthotelluricaci;Telluric acid 98%;orthotelluricacid;TELLURATE HYDROGEN;telluriumhydroxide
CBNumber:
CB7673964
Summenformel:
H6O6Te
Molgewicht:
229.64404
MOL-Datei:
7803-68-1.mol

Orthotellursure Eigenschaften

Schmelzpunkt:
136°C
Siedepunkt:
0℃
Dichte
3.068; d 3.163
Löslichkeit
H2O: 0.1 g/mL, clear, colorless
pka
7.7(at 25℃)
Aggregatzustand
white monoclinic crystals
Farbe
White to Almost white
Wasserlöslichkeit
g H2TeO6/100g H2O: 16.2 (0°C), 41.6 (20°C), 155 (100°C) [LAN05]; tends to polymerize; soluble dilute HNO3 [MER06]
maximale Wellenlänge (λmax)
275nm(H2O)(lit.)
Merck 
14,9120
Solubility Product Constant (Ksp)
pKsp: 53.52
EPA chemische Informationen
Telluric acid (H6TeO6) (7803-68-1)
Sicherheit
  • Risiko- und Sicherheitserklärung
  • Gefahreninformationscode (GHS)
Kennzeichnung gefährlicher Xn
R-Sätze: 20
S-Sätze: 22-36/37/39-38
RIDADR  UN 3284 6.1/PG 3
WGK Germany  3
RTECS-Nr. WY2350000
8
HS Code  2811.19.6190
HazardClass  6.1(a)
PackingGroup  II
Bildanzeige (GHS) GHS hazard pictograms
Alarmwort Warnung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H332 Gesundheitsschädlich bei Einatmen. Akute Toxizität inhalativ Kategorie 4 Warnung P261, P271, P304+P340, P312
Sicherheit
P261 Einatmen von Staub vermeiden.
P271 Nur im Freien oder in gut belüfteten Räumen verwenden.

Orthotellursure Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:

R20:Gesundheitsschädlich beim Einatmen.

S-Sätze Betriebsanweisung:

S22:Staub nicht einatmen.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S38:Bei unzureichender Belüftung Atemschutzgerät anlegen.

Beschreibung

Telluric acid, H6TeO6, is obtained in the form of its salts when tellurium is fused with potassium nitrate plus carbonate, or by the oxidizing action of chlorine on a tellurite in alkaline solution. The free acid may be obtained by decomposing the barium salt with sulfuric acid and concentrating the solution.
where tellurium is in an octahedral coordination. Telluric acid, Te(OH)6, has the CAS number of 7803-68- 1 and a molecular weight of 229.6425 g/mol. It is a white, monoclinic crystal with a density of 3.07 g/cm3. Its melting point is 136°C and its solubility in water is 50.1 g/100 ml.
It is also formed when tellurium dioxide is oxidized by hydrogen peroxide in caustic solution (A. Gutbier, Zest. Anorg. Chem., 1904, 40, p. 260), and perhaps best of all by oxidizing tellurium with a mixture of nitric and chromic acids. It crystallizes as prisms, which lose their water of hydration at 160°C. The tellurates of the alkaline earth metals are more or less soluble in water, those of the other metals being very sparingly or almost insoluble in water. Some tellurates exist in two forms, a colorless form soluble in water and acids, and a yellow form insoluble in water and acids.

Chemische Eigenschaften

White, heavy crystals. Soluble in hot water and alkalies; slightly soluble in cold water.

Physikalische Eigenschaften

White crystals; dimorphic solid; exists in both cubic and monoclinic crystalline forms; density 3.07g/cm3; melts at 136°C; tends to polymerize (similar to stannic acid); forms polymetatelluric acid (H2TeO4)n on strong heating; soluble in water, about 33g/100 mL at 30°C; the solubility decreases as the molecule polymerizes and becomes colloidal; a very weak dibasic acid, pKa1 7.68 and pKa2 11.0 at 18°C; soluble in dilute nitric acid and alkalies.

Verwenden

Chemical reagent.

synthetische

Telluric acid can be prepared by reducing barium tellurate with sulfuric acid: BaTeO4 + H2SO4 + 2H2O → H6TeO6 + BaSO4 Also, telluric acid can be prepared by oxidation of tellurium or tellurium dioxide with a strong oxidizing agent such as hydrogen peroxide, sodium peroxide, chromic acid, or potassium permanganate in nitric acid. Molecular equations for overall reactions are shown below: Te + 3H2O2 → H6TeO6 TeO2 + H2O2 + 2H2O → H6TeO6 Te + 2CrO3 + 3H2O → H6TeO6 + Cr2O3
At cold temperatures at about 1°C, telluric acid crystallizes as tetrahydrate.

Allgemeine Beschreibung

Telluric acids exist in both cubic and monoclinic crystalline forms.1 It may be prepared by treating tellurium and tellurous acid with strong oxidants.

Hazard

As for tellurium.

Sicherheitsprofil

Poison by ingestion and intravenous routes. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS.

läuterung methode

Crystallise it once from nitric acid, then repeatedly from hot water (0.4mL/g). [Fehér in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I pp 451-453 1963.]

Orthotellursure Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


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7803-68-1(Orthotellursure)Verwandte Suche:


  • tellurate
  • telluric
  • telluric(vi)acid
  • telluricacid(h6teo6)
  • telluriumhydroxide
  • TELLURATE HYDROGEN
  • TELLURIC ACID
  • Hydrogen tellurate(VI)
  • Trihydrated telluric oxide
  • Telluric acid 98%
  • Telluric acid puruM, >=99.0% (T)
  • Tellurium hexahydroxide
  • orthotelluricacid
  • TELLURIC ACID ISO 9001:2015 REACH
  • telluric acid, telluric(VI) acid
  • Tellurium Acid
  • Telluric acid, 99%+
  • orthotelluricaci
  • 7803-68-1
  • H6TeO6
  • TeOH6
  • Acids
  • Electronic Chemicals
  • Micro/Nanoelectronics
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