TELLURIC ACID

TELLURIC ACID Basic information
Product Name:TELLURIC ACID
Synonyms:tellurate;telluric;telluric(vi)acid;telluricacid(h6teo6);telluriumhydroxide;TELLURATE HYDROGEN;TELLURIC ACID;Hydrogen tellurate(VI)
CAS:7803-68-1
MF:H6O6Te
MW:229.64404
EINECS:232-267-6
Product Categories:Acids;Electronic Chemicals;Micro/Nanoelectronics
Mol File:7803-68-1.mol
TELLURIC ACID Structure
TELLURIC ACID Chemical Properties
Melting point 136°C
Boiling point 0℃
density 3.068; d 3.163
solubility H2O: 0.1 g/mL, clear, colorless
form white monoclinic crystals
pka7.7(at 25℃)
color White to Almost white
Water Solubility g H2TeO6/100g H2O: 16.2 (0°C), 41.6 (20°C), 155 (100°C) [LAN05]; tends to polymerize; soluble dilute HNO3 [MER06]
λmax275nm(H2O)(lit.)
Merck 14,9120
Solubility Product Constant (Ksp)pKsp: 53.52
EPA Substance Registry SystemTelluric acid (H6TeO6) (7803-68-1)
Safety Information
Hazard Codes Xn
Risk Statements 20
Safety Statements 22-36/37/39-38
RIDADR UN 3284 6.1/PG 3
WGK Germany 3
RTECS WY2350000
8
HS Code 2811.19.6190
HazardClass 6.1(a)
PackingGroup II
MSDS Information
ProviderLanguage
SigmaAldrich English
TELLURIC ACID Usage And Synthesis
DescriptionTelluric 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.

Chemical PropertiesWhite, heavy crystals. Soluble in hot water and alkalies; slightly soluble in cold water.
Physical propertiesWhite 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.
UsesChemical reagent.
PreparationTelluric 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.
DefinitionChEBI: Orthotelluric acid is a tellurium oxoacid. It is a conjugate acid of an orthotellurate(1-).
General DescriptionTelluric acids exist in both cubic and monoclinic crystalline forms.1 It may be prepared by treating tellurium and tellurous acid with strong oxidants.
HazardAs for tellurium.
Safety ProfilePoison by ingestion and intravenous routes. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS.
Purification MethodsCrystallise 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.]
TELLURIC ACID Preparation Products And Raw materials
Preparation ProductsTellurium dioxide-->TELLURIC ACID
Telluric acid magnesium salt Telluric acid cadmium salt Telluric acid hydrogen=sodium salt SODIUM TELLURATE Tellurium Telluric acid dihydrate, 99+%,TELLURIC ACID,Telluric acid (99.5%-Te) SODIUM TELLURATE Telluric acid nickel(II) salt TELLURIC ACID Telluric acid dilithium salt TELLURIC ACID SODIUM TELLURITE Telluric acid tricopper(II) salt Telluric acid dirubidium salt Telluric acid calcium salt CADMIUM TELLURITE TELLURIUM (IV) ETHOXIDE Telluric acid copper(II) salt

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