2Ca3(AsO4)2 → 6Ca2+ + 3O22− + 2As2O5 + 6e−
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- Oxidation of calcium arsenate
- 2Ca3(AsO4)2Calcium arsenate6Ca2+Calcium ion + 3O22−Peroxide ion + 2As2O5Diarsenic pentaoxide + 6e−Electron⟶
Oxidation of calcium arsenate yields calcium ion, peroxide ion, diarsenic pentaoxide (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 calcium arsenate
- 2Ca3(AsO4)2Calcium arsenate6Ca2+Calcium ion + 3O22−Peroxide ion + 2As2O5Diarsenic pentaoxide + 6e−Electron⟶
General equation
- Oxidation of oxidizable species
- ReactantReducing agent ⟶ ProductOxidation product + e−
Oxidation state of each atom
- Oxidation of calcium arsenate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Ca3(AsO4)2 | Calcium arsenate | 2 | Reducing | – |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Ca2+ | Calcium ion | 6 | – | – |
| O22− | Peroxide ion | 3 | Oxidized | – |
| As2O5 | Diarsenic pentaoxide | 2 | – | – |
| e− | Electron | 6 | – | 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 |
|---|---|---|---|---|
| Ca3(AsO4)2 (cr) | -3298.7[1] | -3063.0[1] | 226[1] | – |
| Ca3(AsO4)2 (cr) hydrated precipitate | -3343[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 |
|---|---|---|---|---|
| Ca2+ (g) | 1925.90[1] | – | – | – |
| Ca2+ (ao) | -542.83[1] | -553.58[1] | -53.1[1] | – |
| O22− | – | – | – | – |
| As2O5 (cr) | -924.87[1] | -782.3[1] | 105.4[1] | 116.52[1] |
| As2O5 (aq) | -951.4[1] | – | – | – |
| As2O5 (cr) 4 hydrate | -2104.6[1] | – | – | – |
| e− | – | – | – | – |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (aq):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°, -3298.7 kJ · mol−1
- ^ ΔfG°, -3063.0 kJ · mol−1
- ^ S°, 226. J · K−1 · mol−1
- ^ ΔfH°, -3343. kJ · mol−1
- ^ ΔfH°, 1925.90 kJ · mol−1
- ^ ΔfH°, -542.83 kJ · mol−1
- ^ ΔfG°, -553.58 kJ · mol−1
- ^ S°, -53.1 J · K−1 · mol−1
- ^ ΔfH°, -924.87 kJ · mol−1
- ^ ΔfG°, -782.3 kJ · mol−1
- ^ S°, 105.4 J · K−1 · mol−1
- ^ Cp°, 116.52 J · K−1 · mol−1
- ^ ΔfH°, -951.4 kJ · mol−1
- ^ ΔfH°, -2104.6 kJ · mol−1