9CoSO4 💧⚡→ 3Co3O4 + 9S + 8O3↑
Last updated:
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant
Electrolysis of aqueous cobalt(II) sulfate yields cobalt(II,III) oxide, , and (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant
General equation
- Electrolysis of aqueous solution without water as reactant
- Miscible with water/Very soluble in water/Soluble in waterSelf redox agent💧⚡⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CoSO4 | Cobalt(II) sulfate | 9 | Self redox agent | Very soluble in water |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Co3O4 | Cobalt(II,III) oxide | 3 | Oxidized | – |
| 9 | Reduced | – | ||
| 8 | Oxidized | – |
Thermodynamic changes
Changes in standard condition (1)
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant◆
ΔrG 6024 kJ/mol K 0.44 × 10−1055 pK 1055.36
| 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 | 6463 | 6024 | 1443.1 | – |
per 1 mol of | 718.1 | 669.3 | 160.34 | – |
per 1 mol of | 2154 | 2008 | 481.03 | – |
| 718.1 | 669.3 | 160.34 | – | |
| 807.9 | 753.0 | 180.39 | – |
Changes in standard condition (2)
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant
| 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 | 6466 | – | – | – |
per 1 mol of | 718.4 | – | – | – |
per 1 mol of | 2155 | – | – | – |
| 718.4 | – | – | – | |
| 808.3 | – | – | – |
Changes in aqueous solution (1)
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant◆
ΔrG 6024 kJ/mol K 0.44 × 10−1055 pK 1055.36
| 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 | 6463 | 6024 | 1443.1 | – |
per 1 mol of | 718.1 | 669.3 | 160.34 | – |
per 1 mol of | 2154 | 2008 | 481.03 | – |
| 718.1 | 669.3 | 160.34 | – | |
| 807.9 | 753.0 | 180.39 | – |
Changes in aqueous solution (2)
- Electrolysis of aqueous cobalt(II) sulfate without water as reactant◆
ΔrG 6112 kJ/mol K 0.17 × 10−1070 pK 1070.78
| 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 | 6329 | 6112 | 700 | – |
per 1 mol of | 703.2 | 679.1 | 77.8 | – |
per 1 mol of | 2110 | 2037 | 233 | – |
| 703.2 | 679.1 | 77.8 | – | |
| 791.1 | 764.0 | 87.5 | – |
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 |
|---|---|---|---|---|
| CoSO4 (cr) | -888.3[1] | -782.3[1] | 118.0[1] | – |
| CoSO4 (ai) | -967.3[1] | -799.1[1] | -92[1] | – |
| CoSO4 (cr) 6 hydrate | -2683.6[1] | -2235.36[1] | 367.61[1] | 353.38[1] |
| CoSO4 (cr) 7 hydrate | -2979.93[1] | -2473.42[1] | 406.06[1] | 390.49[1] |
* (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 |
|---|---|---|---|---|
| Co3O4 (cr) | -891[1] | -774[1] | 102.5[1] | 123.4[1] |
| (cr) rhombic | 0[1] | 0[1] | 31.80[1] | 22.64[1] |
| (cr) monoclinic | 0.33[1] | – | – | – |
| (g) | 278.805[1] | 238.250[1] | 167.821[1] | 23.673[1] |
| (g) | 142.7[1] | 163.2[1] | 238.93[1] | 39.20[1] |
| (ao) | 125.9[1] | 174.1[1] | 146[1] | – |
* (cr):Crystalline solid, (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)
- ^ ΔfH°, -888.3 kJ · mol−1
- ^ ΔfG°, -782.3 kJ · mol−1
- ^ S°, 118.0 J · K−1 · mol−1
- ^ ΔfH°, -967.3 kJ · mol−1
- ^ ΔfG°, -799.1 kJ · mol−1
- ^ S°, -92. J · K−1 · mol−1
- ^ ΔfH°, -2683.6 kJ · mol−1
- ^ ΔfG°, -2235.36 kJ · mol−1
- ^ S°, 367.61 J · K−1 · mol−1
- ^ Cp°, 353.38 J · K−1 · mol−1
- ^ ΔfH°, -2979.93 kJ · mol−1
- ^ ΔfG°, -2473.42 kJ · mol−1
- ^ S°, 406.06 J · K−1 · mol−1
- ^ Cp°, 390.49 J · K−1 · mol−1
- ^ ΔfH°, -891. kJ · mol−1
- ^ ΔfG°, -774. kJ · mol−1
- ^ S°, 102.5 J · K−1 · mol−1
- ^ Cp°, 123.4 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 31.80 J · K−1 · mol−1
- ^ Cp°, 22.64 J · K−1 · mol−1
- ^ ΔfH°, 0.33 kJ · mol−1
- ^ ΔfH°, 278.805 kJ · mol−1
- ^ ΔfG°, 238.250 kJ · mol−1
- ^ S°, 167.821 J · K−1 · mol−1
- ^ Cp°, 23.673 J · K−1 · mol−1
- ^ ΔfH°, 142.7 kJ · mol−1
- ^ ΔfG°, 163.2 kJ · mol−1
- ^ S°, 238.93 J · K−1 · mol−1
- ^ Cp°, 39.20 J · K−1 · mol−1
- ^ ΔfH°, 125.9 kJ · mol−1
- ^ ΔfG°, 174.1 kJ · mol−1
- ^ S°, 146. J · K−1 · mol−1