6Cu2SO3 + 10e− → 6Cu2O + S22− + 4SO32−
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- Reduction of copper(I) sulfite
- 6Cu2SO3Copper(I) sulfite + 10e−Electron6Cu2OCopper(I) oxide + S22−Disulfide ion + 4SO32−Sulfurous ion⟶
Reduction of copper(I) sulfite yields copper(I) oxide, disulfide ion, and sulfurous 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 copper(I) sulfite
- 6Cu2SO3Copper(I) sulfite + 10e−Electron6Cu2OCopper(I) oxide + S22−Disulfide ion + 4SO32−Sulfurous ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of copper(I) sulfite
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Cu2SO3 | Copper(I) sulfite | 6 | Oxidizing | – |
| e− | Electron | 10 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Cu2O | Copper(I) oxide | 6 | – | – |
| S22− | Disulfide ion | 1 | Reduced | – |
| SO32− | Sulfurous ion | 4 | – | – |
Thermodynamic changes
Changes in aqueous solution
- Reduction of copper(I) sulfite◆
ΔrG −422.9 kJ/mol K 1.23 × 1074 pK −74.09
| 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 | −571.5 | −422.9 | 171 | – |
per 1 mol of | −95.25 | −70.48 | 28.5 | – |
per 1 mol of Electron | −57.15 | −42.29 | 17.1 | – |
per 1 mol of | −95.25 | −70.48 | 28.5 | – |
per 1 mol of Disulfide ion | −571.5 | −422.9 | 171 | – |
per 1 mol of Sulfurous ion | −142.9 | −105.7 | 42.8 | – |
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 |
|---|---|---|---|---|
| Cu2SO3 (ai) | -492.0[1] | -386.6[1] | 50[1] | – |
| e− | – | – | – | – |
* (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 |
|---|---|---|---|---|
| Cu2O (cr) | -168.6[1] | -146.0[1] | 93.14[1] | 63.64[1] |
| S22− (ao) | 30.1[1] | 79.5[1] | 28.5[1] | – |
| SO32− (ao) | -635.5[1] | -486.5[1] | -29[1] | – |
* (cr):Crystalline solid, (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)
- ^ ΔfH°, -492.0 kJ · mol−1
- ^ ΔfG°, -386.6 kJ · mol−1
- ^ S°, 50. J · K−1 · mol−1
- ^ ΔfH°, -168.6 kJ · mol−1
- ^ ΔfG°, -146.0 kJ · mol−1
- ^ S°, 93.14 J · K−1 · mol−1
- ^ Cp°, 63.64 J · K−1 · mol−1
- ^ ΔfH°, 30.1 kJ · mol−1
- ^ ΔfG°, 79.5 kJ · mol−1
- ^ S°, 28.5 J · K−1 · mol−1
- ^ ΔfH°, -635.5 kJ · mol−1
- ^ ΔfG°, -486.5 kJ · mol−1
- ^ S°, -29. J · K−1 · mol−1