2[Ag(SCN)2]− + 2e− → 2AgSCN + S22− + 2CN−
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- Reduction of bis(thiocyanato)argentate(I) ion
- 2[Ag(SCN)2]−Bis(thiocyanato)argentate(I) ion + 2e−Electron2AgSCNSilver(I) thiocyanate + S22−Disulfide ion + 2CN−Cyanide ion⟶
Reduction of bis(thiocyanato)argentate(I) ion yields silver(I) thiocyanate, disulfide ion, and cyanide 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−Electron2AgSCNSilver(I) thiocyanate + S22−Disulfide ion + 2CN−Cyanide 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 |
|---|---|---|---|---|
| AgSCN | Silver(I) thiocyanate | 2 | – | – |
| S22− | Disulfide ion | 1 | – | – |
| CN− | Cyanide ion | 2 | Reduced | – |
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 |
|---|---|---|---|---|
| AgSCN (cr) | 87.9[1] | 101.39[1] | 131.0[1] | 63[1] |
| AgSCN (ai) | 182.00[1] | 169.80[1] | 217.1[1] | -18.4[1] |
| AgSCN (ao) | – | 142.7[1] | – | – |
| S22− (ao) | 30.1[1] | 79.5[1] | 28.5[1] | – |
| CN− (ao) | 150.6[1] | 172.4[1] | 94.1[1] | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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°, 87.9 kJ · mol−1
- ^ ΔfG°, 101.39 kJ · mol−1
- ^ S°, 131.0 J · K−1 · mol−1
- ^ Cp°, 63. J · K−1 · mol−1
- ^ ΔfH°, 182.00 kJ · mol−1
- ^ ΔfG°, 169.80 kJ · mol−1
- ^ S°, 217.1 J · K−1 · mol−1
- ^ Cp°, -18.4 J · K−1 · mol−1
- ^ ΔfG°, 142.7 kJ · mol−1
- ^ ΔfH°, 30.1 kJ · mol−1
- ^ ΔfG°, 79.5 kJ · mol−1
- ^ S°, 28.5 J · K−1 · mol−1
- ^ ΔfH°, 150.6 kJ · mol−1
- ^ ΔfG°, 172.4 kJ · mol−1
- ^ S°, 94.1 J · K−1 · mol−1