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Ca3(AsO4)2 + 4e → 3Ca2+ + 2As3+ + 8O2−

Reduction of calcium arsenate
Ca3(AsO4)2Calcium arsenate + 4eElectron
3Ca2+Calcium ion + 2As3+Arsenic(III) ion + 8O2−Oxide ion

Reduction of calcium arsenate yields calcium ion, arsenic(III) 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 arsenate
Ca3(AsO4)2Calcium arsenate + 4eElectron
3Ca2+Calcium ion + 2As3+Arsenic(III) ion + 8O2−Oxide ion

General equation

Reduction of reducible species
ReactantOxidizing agent + e
ProductReduction product

Oxidation state of each atom

Reduction of calcium arsenate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Ca3(AsO4)2Calcium arsenate1
Oxidizing
eElectron4
Electron

Products

Chemical formulaNameCoefficientTypeType in general
equation
Ca2+Calcium ion3
As3+Arsenic(III) ion2
Reduced
O2−Oxide ion8

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(AsO4)2 (cr)-3298.7[1]-3063.0[1]226[1]
Ca3(AsO4)2 (cr)
hydrated precipitate
-3343[1]
e
* (cr):Crystalline solid

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]
As3+ (g)5801.1[1]
O2−
* (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1
    Janiel J. Reed (1989)
    The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
    National Institute of Standards and Technology (NIST)