Ca3(PO4)2 + 5e− → 3Ca2+ + P + PO43− + 4O2−
Last updated:
- Reduction of calcium phosphate
Reduction of calcium phosphate yields calcium ion, , phosphate ion, and oxide 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 calcium phosphate
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of calcium phosphate
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
Ca3(PO4)2 | Calcium phosphate | 1 | Oxidizing | – |
e− | Electron | 5 | – | Electron |
Products
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 |
---|---|---|---|---|
Ca3(PO4)2 (cr) β, low temp. form | -4120.8[1] | -3884.7[1] | 236.0[1] | 227.82[1] |
Ca3(PO4)2 (cr) α, high temp. form | -4109.9[1] | -3875.5[1] | 240.91[1] | 231.58[1] |
Ca3(PO4)2 (ai) | -4183.2[1] | -3698.1[1] | -599.9[1] | – |
e− | – | – | – | – |
* (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 |
---|---|---|---|---|
Ca2+ (g) | 1925.90[1] | – | – | – |
Ca2+ (ao) | -542.83[1] | -553.58[1] | -53.1[1] | – |
(cr) white | 0[1] | 0[1] | 41.09[1] | 23.84[1] |
(cr) red, triclinic | -17.6[1] | -12.1[1] | 22.80[1] | 21.21[1] |
(cr) black | -39.3[1] | – | – | – |
(am) red | -7.5[1] | – | – | – |
(g) | 314.64[1] | 278.25[1] | 163.193[1] | 20.786[1] |
PO43− (ao) | -1277.4[1] | -1018.7[1] | -220.3[1] | – |
O2− | – | – | – | – |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (am):Amorphous solid
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°, -4120.8 kJ · mol−1
- ^ ΔfG°, -3884.7 kJ · mol−1
- ^ S°, 236.0 J · K−1 · mol−1
- ^ Cp°, 227.82 J · K−1 · mol−1
- ^ ΔfH°, -4109.9 kJ · mol−1
- ^ ΔfG°, -3875.5 kJ · mol−1
- ^ S°, 240.91 J · K−1 · mol−1
- ^ Cp°, 231.58 J · K−1 · mol−1
- ^ ΔfH°, -4183.2 kJ · mol−1
- ^ ΔfG°, -3698.1 kJ · mol−1
- ^ S°, -599.9 J · K−1 · mol−1
- ^ ΔfH°, 1925.90 kJ · mol−1
- ^ ΔfH°, -542.83 kJ · mol−1
- ^ ΔfG°, -553.58 kJ · mol−1
- ^ S°, -53.1 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 41.09 J · K−1 · mol−1
- ^ Cp°, 23.84 J · K−1 · mol−1
- ^ ΔfH°, -17.6 kJ · mol−1
- ^ ΔfG°, -12.1 kJ · mol−1
- ^ S°, 22.80 J · K−1 · mol−1
- ^ Cp°, 21.21 J · K−1 · mol−1
- ^ ΔfH°, -39.3 kJ · mol−1
- ^ ΔfH°, -7.5 kJ · mol−1
- ^ ΔfH°, 314.64 kJ · mol−1
- ^ ΔfG°, 278.25 kJ · mol−1
- ^ S°, 163.193 J · K−1 · mol−1
- ^ Cp°, 20.786 J · K−1 · mol−1
- ^ ΔfH°, -1277.4 kJ · mol−1
- ^ ΔfG°, -1018.7 kJ · mol−1
- ^ S°, -220.3 J · K−1 · mol−1