HgCl2 + 2e− → Hg + 2Cl−
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- Reduction of mercury(II) chloride
Reduction of mercury(II) chloride yields and chloride 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 mercury(II) chloride
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of mercury(II) chloride
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| HgCl2 | Mercury(II) chloride | 1 | Oxidizing | – |
| e− | Electron | 2 | – | Electron |
Products
Thermodynamic changes
Changes in standard condition
- Reduction of mercury(II) chloride◆
ΔrG −50.0 kJ/mol K 5.75 × 108 pK −8.76 - HgCl2Un-ionized aqueous solution + 2e−Un-ionized aqueous solution + 2Cl−Un-ionized aqueous solution⟶
| 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 | −80.3 | −50.0 | 29 | – |
per 1 mol of | −80.3 | −50.0 | 29 | – |
per 1 mol of Electron | −40.1 | −25.0 | 15 | – |
| −80.3 | −50.0 | 29 | – | |
per 1 mol of Chloride ion | −40.1 | −25.0 | 15 | – |
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 |
|---|---|---|---|---|
| HgCl2 (cr) | -224.3[1] | -178.6[1] | 146.0[1] | – |
| HgCl2 (ao) | -216.3[1] | -173.2[1] | 155[1] | – |
| e− | – | – | – | – |
* (cr):Crystalline solid, (ao):Un-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) | – | – | – | – |
| (l) | 0[1] | 0[1] | 76.02[1] | 27.983[1] |
| (g) | 61.317[1] | 31.820[1] | 174.96[1] | 20.786[1] |
| (ao) | 37.7[1] | 39.3[1] | 71[1] | – |
| Cl− (g) | -233.13[1] | – | – | – |
| Cl− (ao) | -167.159[1] | -131.228[1] | 56.5[1] | -136.4[1] |
* (cr):Crystalline solid, (l):Liquid, (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°, -224.3 kJ · mol−1
- ^ ΔfG°, -178.6 kJ · mol−1
- ^ S°, 146.0 J · K−1 · mol−1
- ^ ΔfH°, -216.3 kJ · mol−1
- ^ ΔfG°, -173.2 kJ · mol−1
- ^ S°, 155. J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 76.02 J · K−1 · mol−1
- ^ Cp°, 27.983 J · K−1 · mol−1
- ^ ΔfH°, 61.317 kJ · mol−1
- ^ ΔfG°, 31.820 kJ · mol−1
- ^ S°, 174.96 J · K−1 · mol−1
- ^ Cp°, 20.786 J · K−1 · mol−1
- ^ ΔfH°, 37.7 kJ · mol−1
- ^ ΔfG°, 39.3 kJ · mol−1
- ^ S°, 71. J · K−1 · mol−1
- ^ ΔfH°, -233.13 kJ · mol−1
- ^ ΔfH°, -167.159 kJ · mol−1
- ^ ΔfG°, -131.228 kJ · mol−1
- ^ S°, 56.5 J · K−1 · mol−1
- ^ Cp°, -136.4 J · K−1 · mol−1