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TELLURIC ACID

CAS No.7803-68-1
Chemical Name:TELLURIC ACID
CBNumber:CB7673964
Molecular Formula:H6O6Te
Formula Weight:229.64404
MOL File:7803-68-1.mol

TELLURIC ACID Property

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
pka 7.7(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]
λmax 275nm(H2O)(lit.)
Merck 14,9120
Solubility Product Constant (Ksp) pKsp: 53.52
EWG's Food Scores 1
FDA UNII WE1KZR49WU
EPA Substance Registry System Telluric acid (H6TeO6) (7803-68-1)
UNSPSC Code 12352300
NACRES NA.23

Safety

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
F :8
HS Code :2811.19.6190
HazardClass :6.1(a)
PackingGroup :II

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordWarning
Hazard statements H332
Precautionary statements P261-P271-P304+P340+P312

TELLURIC ACID Price More Price(8)

Brand: Sigma-Aldrich(India)
Product number: 86375
Product name : Telluric acid
Purity: purum, ≥99.0% (T)
Packaging: 25G
Price: ₹8703.3
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 86375
Product name : Telluric acid
Purity: purum, ≥99.0% (T)
Packaging: 100G
Price: ₹21660.83
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 308463
Product name : Telluric acid
Purity: 98%
Packaging: 25G
Price: ₹11983.28
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 308463
Product name : Telluric acid
Purity: 98%
Packaging: 100G
Price: ₹29952.78
Updated: 2022/06/14
Buy: Buy

Brand: TCI Chemicals (India)
Product number: T3253
Product name : Telluric Acid
Purity:
Packaging: 25G
Price: ₹5500
Updated: 2022/05/26
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TELLURIC ACID Chemical Properties,Usage,Production

Description 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.
Chemical Properties White, heavy crystals. Soluble in hot water and alkalies; slightly soluble in cold water.
Physical properties 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.
Uses Chemical reagent.
Preparation 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.
Definition ChEBI: Orthotelluric acid is a tellurium oxoacid. It is a conjugate acid of an orthotellurate(1-).
General Description 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.
Safety Profile Poison by ingestion and intravenous routes. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS.
Purification Methods 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.]