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9Na4[Fe(CN)6] + 3KMnO4 🔥→ 4Na3[Fe(CN)6] + 24NaCN + K3[Fe(CN)6] + 2Fe2O3 + 3MnO2

The reaction of sodium hexacyanidoferrate(II) and potassium permanganate yields sodium hexacyanidoferrate(III), sodium cyanide, potassium hexacyanidoferrate(III), iron(III) oxide, and manganese(IV) 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 oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Na4[Fe(CN)6]Sodium hexacyanidoferrate(II)9
Reducing
Reducing
KMnO4Potassium permanganate3
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na3[Fe(CN)6]Sodium hexacyanidoferrate(III)4
Oxidized
NaCNSodium cyanide24
K3[Fe(CN)6]Potassium hexacyanidoferrate(III)1
Oxidized
Fe2O3Iron(III) oxide2
Oxidized
MnO2Manganese(IV) oxide3
Reduced

Thermodynamic changes

Changes in aqueous solution

Reaction of sodium hexacyanidoferrate(II) and potassium permanganate
ΔrG−9.6 kJ/mol
K4.81 × 101
pK−1.68
9Na4[Fe(CN)6]Ionized aqueous solution + 3KMnO4Ionized aqueous solution
🔥
4Na3[Fe(CN)6]Ionized aqueous solution + 24NaCNIonized aqueous solution + K3[Fe(CN)6]Ionized aqueous solution + 2Fe2O3Crystalline solid + 3MnO2Crystalline 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
740.1−9.62515.3
82.23−1.1279.48
246.7−3.2838.43
185.0−2.4628.83
per 1 mol of
30.84−0.40104.80
740.1−9.62515.3
per 1 mol of
370.1−4.81257.7
246.7−3.2838.43

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
Na4[Fe(CN)6] (ai)-505.0[1]-352.53[1]331.0[1]
KMnO4 (cr)-837.2[1]-737.6[1]171.71[1]117.57[1]
KMnO4 (ai)-793.8[1]-730.5[1]293.7[1]-60.2[1]
* (ai):Ionized aqueous solution, (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
Na3[Fe(CN)6] (ai)-158.6[1]-56.4[1]447.3[1]
NaCN (cr)
cubic
-87.49[1]-76.43[1]115.60[1]70.37[1]
NaCN (cr)
orthorhombic
-90.75[1]
NaCN (g)109[1]79.94[1]249.43[1]51.17[1]
NaCN (ai)-89.5[1]-89.5[1]153.1[1]
NaCN (cr)
1/2 hydrate
-235.77[1]
NaCN (cr)
2 hydrate
-679.77[1]
K3[Fe(CN)6] (cr)-249.8[1]-129.6[1]426.06[1]
K3[Fe(CN)6] (ai)-195.4[1]-120.4[1]577.8[1]
Fe2O3 (cr)-824.2[1]-742.2[1]87.40[1]103.85[1]
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[1]
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (g):Gas, (am):Amorphous solid

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)