Tungstosilicic acid
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| Tungstosilicic acid | |
|---|---|
| Image:Tungstosilicic acid.jpg | |
| General | |
| Systematic name | ? |
| Other names | Silicotungstic acid |
| Molecular formula | H4[W12SiO40] |
| Molar mass | 2878.2 g/mol |
| Appearance | ? |
| CAS number | [12027-43-9] |
| Properties | |
| Density and phase | ? g/cm3, ? |
| Solubility in water | ? g/100 ml (? °C) |
| Melting point | ? °C (? K) |
| Boiling point | ? °C (? K) |
| Acidity (pKa) | ? |
| Structure | |
| Coordination geometry |
Tetrahedral |
| Crystal structure | ? |
| Dipole moment | zero |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | non-flammable |
| R/S statement | R: ? S: ? |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Related heteropoly acids | ? |
| Related compounds | Tungsten trioxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Tungstosilicic acid is the most commonly encountered heteropoly acid. It is widely used in heterogeneous catalysts, notably in the Showa Denko process for the manufacture of acetic acid.
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