Telluric acid
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| Telluric acid | |
|---|---|
| Image:Telluric acid.jpg | |
| General | |
| Systematic name | Telluric(VI) acid |
| Other names | ? |
| Molecular formula | H6TeO6 |
| Molar mass | 229.64 g/mol |
| Appearance | White crystalline solid. |
| CAS number | [] |
| Properties | |
| Density and phase | 3.07 g/cm3, solid. |
| Solubility in water | Soluble |
| Melting point | 136°C (409.15 K) |
| Boiling point | ?°C (? K) |
| Acidity (pKa) | 7.68 |
| Viscosity | ? cP at ?°C |
| Structure | |
| Molecular shape | ? |
| Crystal structure | ? |
| Dipole moment | ? D |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | ?°C |
| R/S statement | R: ? S: ? |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Other cations | ? |
| Related ? | ? |
| Related compounds | ? |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references |
|
Telluric acid is a chemical compound with the formula Te(OH)6. It is a weak acid, forming tellurate salts with strong bases.[1]
Telluric acid is formed by the oxidation of tellurium or tellurium dioxide with hydrogen peroxide or chromium trioxide.
- TeO2 + 2H2O2 + 2H+ → Te(OH)6
It is oxidizing, as shown by the electrode potential for the reaction below, although it is kinetically slow in its oxidations.
- H6TeO6 + 2H+ + 2e− ⇌ TeO2 + 4H2O2 E
o= +1.02 V
Metatelluric acid, H2TeO4, the analogue of sulfuric acid, is unknown. Telluric acid and its salts always contain hexacoordinate tellurium. This is true even for salts such as barium tellurate, BaTeO4, formed by reaction of tellurium dioxide with barium peroxide, which is isomorphous with barium molybdate.
[edit] References
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
[edit] Sources
- Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999). Advanced Inorganic Chemistry (6th Edn.) New York:Wiley-Interscience. ISBN 0-471-19957-5.
- Lide, D. R. (Ed.) (2002). CRC Handbook of Chemistry and Physics (83rd Edn.). Boca Raton (FL):CRC Press. ISBN 0-8493-0483-0.
[edit] External links
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