2MgS2O3 + 2e− → 2Mg2+ + 2S2− + S2O62−
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- Reduction of magnesium thiosulfate
- 2MgS2O3Magnesium thiosulfate + 2e−Electron2Mg2+Magnesium ion + 2S2−Sulfide ion + S2O62−Dithionate ion⟶
Reduction of magnesium thiosulfate yields magnesium ion, sulfide ion, and dithionate 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 thiosulfate
- 2MgS2O3Magnesium thiosulfate + 2e−Electron2Mg2+Magnesium ion + 2S2−Sulfide ion + S2O62−Dithionate ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of magnesium thiosulfate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| MgS2O3 | Magnesium thiosulfate | 2 | Oxidizing | – |
| e− | Electron | 2 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Mg2+ | Magnesium ion | 2 | – | – |
| S2− | Sulfide ion | 2 | Reduced | – |
| S2O62− | Dithionate ion | 1 | – | – |
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 |
|---|---|---|---|---|
| MgS2O3 (cr) 3 hydrate | -1948.1[1] | – | – | – |
| MgS2O3 (cr) 6 hydrate | -2848.5[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 |
|---|---|---|---|---|
| Mg2+ (g) | 2348.504[1] | – | – | – |
| Mg2+ (ao) | -466.85[1] | -454.8[1] | -138.1[1] | – |
| S2− (ao) | 33.1[1] | 85.8[1] | -14.6[1] | – |
| S2O62− (aq) | -1198.3[1] | – | – | – |
* (g):Gas, (ao):Un-ionized aqueous solution, (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)