2[Ag(SCN)2]− + 2e− → 2AgCN + 2SCN− + S22−
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- Reduction of bis(thiocyanato)argentate(I) ion
- 2[Ag(SCN)2]−Bis(thiocyanato)argentate(I) ion + 2e−Electron2AgCNSilver(I) cyanide + 2SCN−Thiocyanate ion + S22−Disulfide ion⟶
Reduction of bis(thiocyanato)argentate(I) ion yields silver(I) cyanide, thiocyanate ion, and disulfide 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 bis(thiocyanato)argentate(I) ion
- 2[Ag(SCN)2]−Bis(thiocyanato)argentate(I) ion + 2e−Electron2AgCNSilver(I) cyanide + 2SCN−Thiocyanate ion + S22−Disulfide ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of bis(thiocyanato)argentate(I) ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| [Ag(SCN)2]− | Bis(thiocyanato)argentate(I) ion | 2 | Oxidizing | – |
| e− | Electron | 2 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| AgCN | Silver(I) cyanide | 2 | Reduced | – |
| SCN− | Thiocyanate ion | 2 | – | – |
| S22− | Disulfide 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 |
|---|---|---|---|---|
| [Ag(SCN)2]− | – | – | – | – |
| e− | – | – | – | – |
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 |
|---|---|---|---|---|
| AgCN (cr) | 96.2[1] | 111.3[1] | 84.5[1] | – |
| SCN− (ao) | 76.44[1] | 92.71[1] | 144.3[1] | -40.2[1] |
| S22− (ao) | 30.1[1] | 79.5[1] | 28.5[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)