3Mg3(AsO4)2 + 12e− → 9MgO + 5AsO33− + As3+
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- Reduction of magnesium arsenate
- 3Mg3(AsO4)2Magnesium arsenate + 12e−Electron9MgOMagnesium oxide + 5AsO33−Arsenite ion + As3+Arsenic(III) ion⟶
Reduction of magnesium arsenate yields magnesium oxide, arsenite ion, and arsenic(III) ion (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reduction of magnesium arsenate
- 3Mg3(AsO4)2Magnesium arsenate + 12e−Electron9MgOMagnesium oxide + 5AsO33−Arsenite ion + As3+Arsenic(III) ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of magnesium arsenate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Mg3(AsO4)2 | Magnesium arsenate | 3 | Oxidizing | – |
| e− | Electron | 12 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| MgO | Magnesium oxide | 9 | – | – |
| AsO33− | Arsenite ion | 5 | Reduced | – |
| As3+ | Arsenic(III) ion | 1 | Reduced | – |
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 |
|---|---|---|---|---|
| Mg3(AsO4)2 (cr) | -3092.8[1] | – | – | – |
| e− | – | – | – | – |
* (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 |
|---|---|---|---|---|
| MgO (cr) | -597.98[1] | -565.95[1] | 27.91[1] | 37.66[1] |
| MgO (g) | 17[1] | – | – | – |
| AsO33− | – | – | – | – |
| As3+ (g) | 5801.1[1] | – | – | – |
* (cr):Crystalline solid, (g):Gas
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)