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Ca3(PO4)2 + 5e → 3Ca2+ + P + PO43− + 4O2−

Reduction of calcium phosphate
Ca3(PO4)2Calcium phosphate + 5eElectron
3Ca2+Calcium ion + PPhosphorus + PO43−Phosphate ion + 4O2−Oxide ion

Reduction of calcium phosphate yields calcium ion, phosphorus, phosphate ion, and oxide ion (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

Reduction of calcium phosphate
Ca3(PO4)2Calcium phosphate + 5eElectron
3Ca2+Calcium ion + PPhosphorus + PO43−Phosphate ion + 4O2−Oxide ion

General equation

Reduction of reducible species
ReactantOxidizing agent + e
ProductReduction product

Oxidation state of each atom

Reduction of calcium phosphate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Ca3(PO4)2Calcium phosphate1
Oxidizing
eElectron5
Electron

Products

Chemical formulaNameCoefficientTypeType in general
equation
Ca2+Calcium ion3
PPhosphorus1
Reduced
PO43−Phosphate ion1
O2−Oxide ion4

Thermodynamic changes

Thermodynamic data of reactants

Chemical formulaStandard 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 formulaStandard 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]
P (cr)
white
0[1]0[1]41.09[1]23.84[1]
P (cr)
red, triclinic
-17.6[1]-12.1[1]22.80[1]21.21[1]
P (cr)
black
-39.3[1]
P (am)
red
-7.5[1]
P (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

  1. 1