8(NH4)3PO4 → N2↑ + 8HPO42− + 22NH4+ + 6e−
Last updated:
- Oxidation of ammonium phosphate
Oxidation of ammonium phosphate yields , hydrogenphosphate ion, ammonium ion (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Oxidation of ammonium phosphate
General equation
- Oxidation of oxidizable species
- ReactantReducing agent ⟶ ProductOxidation product + e−
Oxidation state of each atom
- Oxidation of ammonium phosphate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| (NH4)3PO4 | Ammonium phosphate | 8 | Reducing | – |
Products
Thermodynamic changes
Changes in standard condition
- Oxidation of ammonium phosphate◆
ΔrG −405.2 kJ/mol K 9.73 × 1070 pK −70.99 - 8(NH4)3PO4Ionized aqueous solution↑Gas + 8HPO42−Un-ionized aqueous solution + 22NH4+Un-ionized aqueous solution + 6e−⟶
| 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 | 146.9 | −405.2 | 1482 | – |
per 1 mol of | 18.36 | −50.65 | 185.3 | – |
| 146.9 | −405.2 | 1482 | – | |
per 1 mol of Hydrogenphosphate ion | 18.36 | −50.65 | 185.3 | – |
per 1 mol of Ammonium ion | 6.677 | −18.42 | 67.36 | – |
per 1 mol of Electron | 24.48 | −67.53 | 247.0 | – |
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 |
|---|---|---|---|---|
| (NH4)3PO4 (cr) | -1671.9[1] | – | – | – |
| (NH4)3PO4 (ai) | -1674.9[1] | -1256.6[1] | 117[1] | – |
| (NH4)3PO4 (cr) 3 hydrate | -2555.6[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 |
|---|---|---|---|---|
| (g) | 0[1] | 0[1] | 191.61[1] | 29.125[1] |
| HPO42− (ao) | -1292.14[1] | -1089.15[1] | -33.5[1] | – |
| NH4+ (ao) | -132.51[1] | -79.31[1] | 113.4[1] | 79.9[1] |
| e− | – | – | – | – |
* (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°, -1671.9 kJ · mol−1
- ^ ΔfH°, -1674.9 kJ · mol−1
- ^ ΔfG°, -1256.6 kJ · mol−1
- ^ S°, 117. J · K−1 · mol−1
- ^ ΔfH°, -2555.6 kJ · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 191.61 J · K−1 · mol−1
- ^ Cp°, 29.125 J · K−1 · mol−1
- ^ ΔfH°, -1292.14 kJ · mol−1
- ^ ΔfG°, -1089.15 kJ · mol−1
- ^ S°, -33.5 J · K−1 · mol−1
- ^ ΔfH°, -132.51 kJ · mol−1
- ^ ΔfG°, -79.31 kJ · mol−1
- ^ S°, 113.4 J · K−1 · mol−1
- ^ Cp°, 79.9 J · K−1 · mol−1