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2Na2SeO3 + O2 → 2Na2SeO4

The reaction of sodium selenite and oxygen yields sodium selenate. 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 categories

Reaction data

Chemical equation

General equation

Reaction of oxidizable species and oxidizing species
Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of sodium selenite and oxygen

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Na2SeO3Sodium selenite2
Reducing
Oxidizable
O2Oxygen1
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na2SeO4Sodium selenate2
Redoxed product

Thermodynamic changes

Changes in standard condition

Reaction of sodium selenite and oxygen
2Na2SeO3Crystalline solid + O2Gas
2Na2SeO4Crystalline solid
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
−220.8
per 1 mol of
−110.4
per 1 mol of
−220.8
per 1 mol of
−110.4

Changes in aqueous solution

Reaction of sodium selenite and oxygen
ΔrG−159.4 kJ/mol
K8.43 × 1027
pK−27.93
2Na2SeO3Ionized aqueous solution + O2Un-ionized aqueous solution
2Na2SeO4Ionized aqueous solution
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
−168.3−159.4−27
per 1 mol of
−84.15−79.70−14
per 1 mol of
−168.3−159.4−27
per 1 mol of
−84.15−79.70−14

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
Na2SeO3 (cr)-958.6[1]
Na2SeO3 (ai)-989.5[1]-893.7[1]130[1]
Na2SeO3 (cr)
5 hydrate
-2404.13[1]
O2 (g)0[1]0[1]205.138[1]29.355[1]
O2 (ao)-11.7[1]16.4[1]110.9[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (ao):Un-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
Na2SeO4 (cr)-1069.0[1]
Na2SeO4 (ai)-1079.5[1]-965.2[1]172.0[1]
Na2SeO4 (cr)
10 hydrate
-4006.6[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution

References

List of references

  1. 1