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Na2SO3 + 2MnO2 → Na2SO4 + Mn2O3

The reaction of sodium sulfite and manganese(IV) oxide yields sodium sulfate and manganese(III) 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
Na2SO3Sodium sulfite1
Reducing
Reducing
MnO2Manganese(IV) oxide2
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na2SO4Sodium sulfate1
Oxidized
Mn2O3Manganese(III) oxide1
Reduced

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium sulfite and manganese(IV) oxide
ΔrG−208.5 kJ/mol
K3.37 × 1036
pK−36.53
Na2SO3Crystalline solid + 2MnO2Crystalline solid
Na2SO4Crystalline solidorthorhombic + Mn2O3Crystalline 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
−205.2−208.58.07.32
per 1 mol of
−205.2−208.58.07.32
−102.6−104.34.03.66
per 1 mol of
−205.2−208.58.07.32
−205.2−208.58.07.32

Changes in standard condition (2)

Reaction of sodium sulfite and manganese(IV) oxide
Na2SO3Crystalline solid + 2MnO2Crystalline solid
Na2SO4Crystalline solidmetastable + Mn2O3Crystalline 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
13.48.41
per 1 mol of
13.48.41
6.704.21
per 1 mol of
13.48.41
13.48.41

Changes in standard condition (3)

Reaction of sodium sulfite and manganese(IV) oxide
Na2SO3Crystalline solid + 2MnO2Amorphous solidprecipitated
Na2SO4Crystalline solidorthorhombic + Mn2O3Crystalline 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
−240.3
per 1 mol of
−240.3
−120.2
per 1 mol of
−240.3
−240.3

Changes in standard condition (4)

Reaction of sodium sulfite and manganese(IV) oxide
Na2SO3Crystalline solid + 2MnO2Amorphous solidprecipitated
Na2SO4Crystalline solidmetastable + Mn2O3Crystalline 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

Changes in aqueous solution

Reaction of sodium sulfite and manganese(IV) oxide
ΔrG−208.8 kJ/mol
K3.80 × 1036
pK−36.58
Na2SO3Ionized aqueous solution + 2MnO2Crystalline solid
Na2SO4Ionized aqueous solution + Mn2O3Crystalline 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
−192.6−208.854.6
per 1 mol of
−192.6−208.854.6
−96.30−104.427.3
per 1 mol of
−192.6−208.854.6
−192.6−208.854.6

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
Na2SO3 (cr)-1100.8[1]-1012.5[1]145.94[1]120.25[1]
Na2SO3 (ai)-1115.87[1]-1010.39[1]87.9[1]
Na2SO3 (cr)
7 hydrate
-3162.3[1]-2676.1[1]444[1]
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (am):Amorphous 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
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]
Mn2O3 (cr)-959.0[1]-881.1[1]110.5[1]107.65[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution

References

List of references

  1. 1