2CdSO4 + 2e− → 2CdO + S2O62−
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- Reduction of cadmium sulfate
Reduction of cadmium sulfate yields cadmium oxide 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 cadmium sulfate
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of cadmium sulfate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CdSO4 | Cadmium sulfate | 2 | Oxidizing | – |
| e− | Electron | 2 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CdO | Cadmium oxide | 2 | – | – |
| S2O62− | Dithionate ion | 1 | Reduced | – |
Thermodynamic changes
Changes in standard condition
- Reduction of cadmium sulfate
| Standard enthalpy of reaction ΔrH° kJ · mol−1 | Standard Gibbs energy of reaction ΔrG° kJ · mol−1 | Standard entropy of reaction ΔrS° J · K−1 · mol−1 | Standard heat capacity of reaction at constant pressure ΔrCp° J · K−1 · mol−1 | |
|---|---|---|---|---|
per 1 mol of Equation | 151.9 | – | – | – |
per 1 mol of | 75.95 | – | – | – |
per 1 mol of Electron | 75.95 | – | – | – |
per 1 mol of | 75.95 | – | – | – |
per 1 mol of Dithionate ion | 151.9 | – | – | – |
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 |
|---|---|---|---|---|
| CdSO4 (cr) | -933.28[1] | -822.72[1] | 123.039[1] | 99.58[1] |
| CdSO4 (ai) | -985.16[1] | -822.13[1] | -53.1[1] | – |
| CdSO4 (cr) 1 hydrate | -1239.55[1] | -1068.73[1] | 154.030[1] | 134.56[1] |
| CdSO4 (cr) 8/3 hydrate | -1729.4[1] | -1465.141[1] | 229.630[1] | 213.26[1] |
| e− | – | – | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution
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 |
|---|---|---|---|---|
| CdO (cr) | -258.2[1] | -228.4[1] | 54.8[1] | 43.43[1] |
| S2O62− (aq) | -1198.3[1] | – | – | – |
* (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°, -933.28 kJ · mol−1
- ^ ΔfG°, -822.72 kJ · mol−1
- ^ S°, 123.039 J · K−1 · mol−1
- ^ Cp°, 99.58 J · K−1 · mol−1
- ^ ΔfH°, -985.16 kJ · mol−1
- ^ ΔfG°, -822.13 kJ · mol−1
- ^ S°, -53.1 J · K−1 · mol−1
- ^ ΔfH°, -1239.55 kJ · mol−1
- ^ ΔfG°, -1068.73 kJ · mol−1
- ^ S°, 154.030 J · K−1 · mol−1
- ^ Cp°, 134.56 J · K−1 · mol−1
- ^ ΔfH°, -1729.4 kJ · mol−1
- ^ ΔfG°, -1465.141 kJ · mol−1
- ^ S°, 229.630 J · K−1 · mol−1
- ^ Cp°, 213.26 J · K−1 · mol−1
- ^ ΔfH°, -258.2 kJ · mol−1
- ^ ΔfG°, -228.4 kJ · mol−1
- ^ S°, 54.8 J · K−1 · mol−1
- ^ Cp°, 43.43 J · K−1 · mol−1
- ^ ΔfH°, -1198.3 kJ · mol−1