Ca3(AsO4)2 + 4e− → 3Ca2+ + 2As3+ + 8O2−
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- Reduction of calcium arsenate
Reduction of calcium arsenate yields calcium ion, arsenic(III) ion, and oxide 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 calcium arsenate
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of calcium arsenate
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
Ca3(AsO4)2 | Calcium arsenate | 1 | Oxidizing | – |
e− | Electron | 4 | – | Electron |
Products
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
Ca2+ | Calcium ion | 3 | – | – |
As3+ | Arsenic(III) ion | 2 | Reduced | – |
O2− | Oxide ion | 8 | – | – |
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] | – | – | – |
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 |
---|---|---|---|---|
Ca2+ (g) | 1925.90[1] | – | – | – |
Ca2+ (ao) | -542.83[1] | -553.58[1] | -53.1[1] | – |
As3+ (g) | 5801.1[1] | – | – | – |
O2− | – | – | – | – |
* (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)