9HClO2 + 4e− → Cl2O↑ + 3H3O+ + 7ClO2−
Last updated:
- Reduction of chlorous acid
- 9HClO2Chlorous acid + 4e−ElectronCl2O↑Dichlorine monoxide + 3H3O+Hydronium ion + 7ClO2−Chlorite ion⟶
Reduction of chlorous acid yields dichlorine monoxide, hydronium ion, and chlorite 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 chlorous acid
- 9HClO2Chlorous acid + 4e−ElectronCl2O↑Dichlorine monoxide + 3H3O+Hydronium ion + 7ClO2−Chlorite ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of chlorous acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| HClO2 | Chlorous acid | 9 | Oxidizing | – |
| e− | Electron | 4 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Cl2O | Dichlorine monoxide | 1 | Reduced | – |
| H3O+ | Hydronium ion | 3 | – | – |
| ClO2− | Chlorite ion | 7 | – | – |
Thermodynamic changes
Changes in standard condition
- Reduction of chlorous acid◆
ΔrG −546.2 kJ/mol K 4.90 × 1095 pK −95.69
| 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 | −775.6 | −546.2 | −509.7 | – |
per 1 mol of | −86.18 | −60.69 | −56.63 | – |
per 1 mol of Electron | −193.9 | −136.6 | −127.4 | – |
per 1 mol of | −775.6 | −546.2 | −509.7 | – |
per 1 mol of Hydronium ion | −258.5 | −182.1 | −169.9 | – |
per 1 mol of Chlorite ion | −110.8 | −78.03 | −72.81 | – |
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 |
|---|---|---|---|---|
| HClO2 (ao) | -51.9[1] | 5.9[1] | 188.3[1] | – |
| e− | – | – | – | – |
* (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 |
|---|---|---|---|---|
| Cl2O (g) | 80.3[1] | 97.9[1] | 266.21[1] | 45.40[1] |
| H3O+ (ao) | -285.830[1] | -237.129[1] | 69.91[1] | 75.291[1] |
| ClO2− (ao) | -66.5[1] | 17.2[1] | 101.3[1] | – |
* (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°, -51.9 kJ · mol−1
- ^ ΔfG°, 5.9 kJ · mol−1
- ^ S°, 188.3 J · K−1 · mol−1
- ^ ΔfH°, 80.3 kJ · mol−1
- ^ ΔfG°, 97.9 kJ · mol−1
- ^ S°, 266.21 J · K−1 · mol−1
- ^ Cp°, 45.40 J · K−1 · mol−1
- ^ ΔfH°, -285.830 kJ · mol−1
- ^ ΔfG°, -237.129 kJ · mol−1
- ^ S°, 69.91 J · K−1 · mol−1
- ^ Cp°, 75.291 J · K−1 · mol−1
- ^ ΔfH°, -66.5 kJ · mol−1
- ^ ΔfG°, 17.2 kJ · mol−1
- ^ S°, 101.3 J · K−1 · mol−1