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Na2S2O3 + 4Fe2O3 → Na2SO4 + FeSO4 + 7FeO

The reaction of sodium thiosulfate and iron(III) oxide yields sodium sulfate, iron(II) sulfate, and iron(II) oxide (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

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Na2S2O3Sodium thiosulfate1
Reducing
Reducing
Fe2O3Iron(III) oxide4
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na2SO4Sodium sulfate1
Oxidized
FeSO4Iron(II) sulfate1
Redoxed product
FeOIron(II) oxide7
Reduced

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium thiosulfate and iron(III) oxide
Na2S2O3Crystalline solid + 4Fe2O3Crystalline solid
Na2SO4Crystalline solidorthorhombic + FeSO4Crystalline solid + 7FeOCrystalline 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
200.3
per 1 mol of
200.3
per 1 mol of
50.08
per 1 mol of
200.3
per 1 mol of
200.3
per 1 mol of
28.61

Changes in standard condition (2)

Reaction of sodium thiosulfate and iron(III) oxide
Na2S2O3Crystalline solid + 4Fe2O3Crystalline solid
Na2SO4Crystalline solidmetastable + FeSO4Crystalline solid + 7FeOCrystalline 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
per 1 mol of
per 1 mol of
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution

Reaction of sodium thiosulfate and iron(III) oxide
Na2S2O3Ionized aqueous solution + 4Fe2O3Crystalline solid
Na2SO4Ionized aqueous solution + FeSO4Crystalline solid + 7FeOCrystalline 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
207.3
per 1 mol of
207.3
per 1 mol of
51.83
per 1 mol of
207.3
per 1 mol of
207.3
per 1 mol of
29.61

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
Na2S2O3 (cr)-1123.0[1]-1028.0[1]155[1]
Na2S2O3 (ai)-1132.40[1]-1046.0[1]184.1[1]
Na2S2O3 (cr)
5 hydrate
-2607.93[1]-2229.8[1]372[1]
Fe2O3 (cr)-824.2[1]-742.2[1]87.40[1]103.85[1]
* (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
Na2SO4 (cr)
orthorhombic
-1387.08[1]-1270.16[1]149.58[1]128.20[1]
Na2SO4 (cr)
metastable
154.934[1]129.29[1]
Na2SO4 (ai)-1389.51[1]-1268.36[1]138.1[1]-201[1]
Na2SO4 (cr)
10 hydrate
-4327.26[1]-3646.85[1]592.0[1]
FeSO4 (cr)-928.4[1]-820.8[1]107.5[1]100.58[1]
FeSO4 (ai)-998.3[1]-823.43[1]-117.6[1]
FeSO4 (cr)
1 hydrate
-1243.69[1]
FeSO4 (cr)
4 hydrate
-2129.2[1]
FeSO4 (cr)
7 hydrate
-3014.57[1]-2509.87[1]409.2[1]394.47[1]
FeO (cr)-272.0[1]
* (cr):Crystalline solid, (ai):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)