2Na2Se + 2KMnO4 → 2Na2MnO4 + Se + K2Se
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The reaction of sodium selenide and potassium permanganate yields sodium manganate, , and potassium selenide (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of sodium selenide and potassium permanganate
General equation
- Reaction of reducing species and oxidizing species
- Reducing speciesReducing agent + Oxidizing speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of sodium selenide and potassium permanganate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2Se | Sodium selenide | 2 | Reducing | Reducing |
| KMnO4 | Potassium permanganate | 2 | Oxidizing | Oxidizing |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2MnO4 | Sodium manganate | 2 | Reduced | – |
| 1 | Oxidized | – | ||
| K2Se | Potassium selenide | 1 | – | – |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of sodium selenide and potassium permanganate
| 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 | −349.8 | – | – | – |
per 1 mol of | −174.9 | – | – | – |
per 1 mol of | −174.9 | – | – | – |
per 1 mol of | −174.9 | – | – | – |
| −349.8 | – | – | – | |
per 1 mol of | −349.8 | – | – | – |
Changes in standard condition (2)
- Reaction of sodium selenide and potassium permanganate
| 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 | −343.1 | – | – | – |
per 1 mol of | −171.6 | – | – | – |
per 1 mol of | −171.6 | – | – | – |
per 1 mol of | −171.6 | – | – | – |
| −343.1 | – | – | – | |
per 1 mol of | −343.1 | – | – | – |
Changes in aqueous solution
- Reaction of sodium selenide and potassium permanganate◆
ΔrG −236.2 kJ/mol K 2.40 × 1041 pK −41.38
| 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 | – | −236.2 | – | – |
per 1 mol of | – | −118.1 | – | – |
per 1 mol of | – | −118.1 | – | – |
per 1 mol of | – | −118.1 | – | – |
| – | −236.2 | – | – | |
per 1 mol of | – | −236.2 | – | – |
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 |
|---|---|---|---|---|
| Na2Se (cr) | -341.4[1] | – | – | – |
| Na2Se (ai) | – | -394.6[1] | – | – |
| Na2Se (cr) 4.5 hydrate | -1741.0[1] | – | – | – |
| Na2Se (cr) 9 hydrate | -3040.1[1] | – | – | – |
| Na2Se (cr) 16 hydrate | -5091.9[1] | – | – | – |
| KMnO4 (cr) | -837.2[1] | -737.6[1] | 171.71[1] | 117.57[1] |
| KMnO4 (ai) | -793.8[1] | -730.5[1] | 293.7[1] | -60.2[1] |
* (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 |
|---|---|---|---|---|
| Na2MnO4 (cr) | -1156.0[1] | – | – | – |
| Na2MnO4 (ai) | -1134[1] | -1024.6[1] | 176[1] | – |
| (cr) hexagonal, gray | 0[1] | 0[1] | 42.442[1] | 25.363[1] |
| (cr) monoclinic, red | 6.7[1] | – | – | – |
| (vit) | 5.0[1] | – | – | – |
| (g) | 227.07[1] | 187.03[1] | 176.72[1] | 20.820[1] |
| K2Se (cr) | -395.0[1] | – | – | – |
| K2Se (ai) | – | -437.2[1] | – | – |
| K2Se (cr) 9 hydrate | -3087.0[1] | – | – | – |
| K2Se (cr) 14 hydrate | -4524.2[1] | – | – | – |
| K2Se (cr) 19 hydrate | -5991.9[1] | – | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (vit):Vitreous liquid, (g):Gas
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°, -341.4 kJ · mol−1
- ^ ΔfG°, -394.6 kJ · mol−1
- ^ ΔfH°, -1741.0 kJ · mol−1
- ^ ΔfH°, -3040.1 kJ · mol−1
- ^ ΔfH°, -5091.9 kJ · mol−1
- ^ ΔfH°, -837.2 kJ · mol−1
- ^ ΔfG°, -737.6 kJ · mol−1
- ^ S°, 171.71 J · K−1 · mol−1
- ^ Cp°, 117.57 J · K−1 · mol−1
- ^ ΔfH°, -793.8 kJ · mol−1
- ^ ΔfG°, -730.5 kJ · mol−1
- ^ S°, 293.7 J · K−1 · mol−1
- ^ Cp°, -60.2 J · K−1 · mol−1
- ^ ΔfH°, -1156.0 kJ · mol−1
- ^ ΔfH°, -1134. kJ · mol−1
- ^ ΔfG°, -1024.6 kJ · mol−1
- ^ S°, 176. J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 42.442 J · K−1 · mol−1
- ^ Cp°, 25.363 J · K−1 · mol−1
- ^ ΔfH°, 6.7 kJ · mol−1
- ^ ΔfH°, 5.0 kJ · mol−1
- ^ ΔfH°, 227.07 kJ · mol−1
- ^ ΔfG°, 187.03 kJ · mol−1
- ^ S°, 176.72 J · K−1 · mol−1
- ^ Cp°, 20.820 J · K−1 · mol−1
- ^ ΔfH°, -395.0 kJ · mol−1
- ^ ΔfG°, -437.2 kJ · mol−1
- ^ ΔfH°, -3087.0 kJ · mol−1
- ^ ΔfH°, -4524.2 kJ · mol−1
- ^ ΔfH°, -5991.9 kJ · mol−1