Al2O3 · SiO2 → 2Al3+ + O22− + SiO32− + 2e−
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- Oxidation of aluminium silicate
- Al2O3 · SiO2Aluminium silicate2Al3+Aluminium ion + O22−Peroxide ion + SiO32−Metasilicate ion + 2e−Electron⟶
Oxidation of aluminium silicate yields aluminium ion, peroxide ion, metasilicate ion (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Oxidation of aluminium silicate
- Al2O3 · SiO2Aluminium silicate2Al3+Aluminium ion + O22−Peroxide ion + SiO32−Metasilicate ion + 2e−Electron⟶
General equation
- Oxidation of oxidizable species
- ReactantReducing agent ⟶ ProductOxidation product + e−
Oxidation state of each atom
- Oxidation of aluminium silicate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Al2O3 · SiO2 | Aluminium silicate | 1 | Reducing | – |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Al3+ | Aluminium ion | 2 | – | – |
| O22− | Peroxide ion | 1 | Oxidized | – |
| SiO32− | Metasilicate ion | 1 | – | – |
| e− | Electron | 2 | – | Electron |
Thermodynamic changes
Thermodynamic data of reactants
| Chemical formula | Standard enthalpy of formation ΔfH° kJ · mol−1 | Standard Gibbs energy of formation ΔfG° kJ · mol−1 | Standard molar entropy S° J · K−1 · mol−1 | Standard molar heat capacity at constant pressure Cp° J · K−1 · mol−1 |
|---|---|---|---|---|
| Al2O3 · SiO2 (cr) andalusite | -2590.27[1] | -2442.66[1] | 93.22[1] | 122.72[1] |
| Al2O3 · SiO2 (cr) kyanite | -2594.29[1] | -2443.88[1] | 83.81[1] | 121.71[1] |
| Al2O3 · SiO2 (cr) sillimanite | -2587.76[1] | -2440.99[1] | 96.11[1] | 124.52[1] |
* (cr):Crystalline solid
Thermodynamic data of products
| Chemical formula | Standard enthalpy of formation ΔfH° kJ · mol−1 | Standard Gibbs energy of formation ΔfG° kJ · mol−1 | Standard molar entropy S° J · K−1 · mol−1 | Standard molar heat capacity at constant pressure Cp° J · K−1 · mol−1 |
|---|---|---|---|---|
| Al3+ (g) | 5483.17[1] | – | – | – |
| Al3+ (ao) | -531[1] | -485[1] | -321.7[1] | – |
| O22− | – | – | – | – |
| SiO32− (ao) | -1104.576[2] | -939.764[2] | -96.232[2] | – |
| e− | – | – | – | – |
* (g):Gas, (ao):Un-ionized aqueous solution
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)
- ^ ΔfH°, -2590.27 kJ · mol−1
- ^ ΔfG°, -2442.66 kJ · mol−1
- ^ S°, 93.22 J · K−1 · mol−1
- ^ Cp°, 122.72 J · K−1 · mol−1
- ^ ΔfH°, -2594.29 kJ · mol−1
- ^ ΔfG°, -2443.88 kJ · mol−1
- ^ S°, 83.81 J · K−1 · mol−1
- ^ Cp°, 121.71 J · K−1 · mol−1
- ^ ΔfH°, -2587.76 kJ · mol−1
- ^ ΔfG°, -2440.99 kJ · mol−1
- ^ S°, 96.11 J · K−1 · mol−1
- ^ Cp°, 124.52 J · K−1 · mol−1
- ^ ΔfH°, 5483.17 kJ · mol−1
- ^ ΔfH°, -531. kJ · mol−1
- ^ ΔfG°, -485. kJ · mol−1
- ^ S°, -321.7 J · K−1 · mol−1
- 2Colin Stuart Walker, Anraku Sohtaro, Oda Chie, Mitsui Seiichiro, Mihara MorihiroThermodynamic properties of SiO2(aq), HSiO3– and SiO3-2Japan Atomic Energy Agency