2K2S2O3 + 14e− → 2K + 2S22− + K2O + 5O2−
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- Reduction of potassium thiosulfate
- 2K2S2O3Potassium thiosulfate + 14e−Electron2 + 2S22−Disulfide ion + K2OPotassium oxide + 5O2−Oxide ion⟶
Reduction of potassium thiosulfate yields , disulfide ion, potassium oxide, 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 potassium thiosulfate
- 2K2S2O3Potassium thiosulfate + 14e−Electron2 + 2S22−Disulfide ion + K2OPotassium oxide + 5O2−Oxide ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of potassium thiosulfate
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
K2S2O3 | Potassium thiosulfate | 2 | Oxidizing | – |
e− | Electron | 14 | – | Electron |
Products
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
2 | Reduced | – | ||
S22− | Disulfide ion | 2 | Reduced | – |
K2O | Potassium oxide | 1 | – | – |
O2− | Oxide ion | 5 | – | – |
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 |
---|---|---|---|---|
K2S2O3 (cr) | -1173.6[1] | – | – | – |
K2S2O3 (ai) | -1156.9[1] | -1089.0[1] | 272[1] | – |
K2S2O3 (cr) 1 hydrate | -1464.8[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 |
---|---|---|---|---|
(cr) | 0[1] | 0[1] | 64.18[1] | 29.58[1] |
(g) | 89.24[1] | 60.59[1] | 160.336[1] | 20.786[1] |
S22− (ao) | 30.1[1] | 79.5[1] | 28.5[1] | – |
K2O (cr) | -361.5[1] | -322.1[2] | 94.1[2] | 83.7[2] |
K2O (g) | -63[1] | – | – | – |
O2− | – | – | – | – |
* (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°, -1173.6 kJ · mol−1
- ^ ΔfH°, -1156.9 kJ · mol−1
- ^ ΔfG°, -1089.0 kJ · mol−1
- ^ S°, 272. J · K−1 · mol−1
- ^ ΔfH°, -1464.8 kJ · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 64.18 J · K−1 · mol−1
- ^ Cp°, 29.58 J · K−1 · mol−1
- ^ ΔfH°, 89.24 kJ · mol−1
- ^ ΔfG°, 60.59 kJ · mol−1
- ^ S°, 160.336 J · K−1 · mol−1
- ^ Cp°, 20.786 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°, -361.5 kJ · mol−1
- ^ ΔfH°, -63. kJ · mol−1
- 2James G. Speight (2017)Lange's Handbook of Chemistry, 17th editionMcGraw Hill Education
- ^ ΔfG°, -322.1 kJ · mol−1 - p.280
- ^ S°, 94.1 J · K−1 · mol−1 - p.280
- ^ Cp°, 83.7 J · K−1 · mol−1 - p.280