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9Na4[Fe(CN)6] + 2MnO2 🔥→ 6Na3[Fe(CN)6] + 18NaCN + Fe3O4 + 2Mn

The reaction of sodium hexacyanidoferrate(II) and manganese(IV) oxide yields sodium hexacyanidoferrate(III), sodium cyanide, iron(II,III) oxide, and manganese (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
Na4[Fe(CN)6]Sodium hexacyanidoferrate(II)9
Reducing
Reducing
MnO2Manganese(IV) oxide2
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na3[Fe(CN)6]Sodium hexacyanidoferrate(III)6
Oxidized
NaCNSodium cyanide18
Fe3O4Iron(II,III) oxide1
Oxidized
MnManganese2
Reduced

Thermodynamic changes

Changes in aqueous solution

Reaction of sodium hexacyanidoferrate(II) and manganese(IV) oxide
ΔrG1138.3 kJ/mol
K0.38 × 10−199
pK199.42
9Na4[Fe(CN)6]Ionized aqueous solution + 2MnO2Crystalline solid
🔥
6Na3[Fe(CN)6]Ionized aqueous solution + 18NaCNIonized aqueous solution + Fe3O4Crystalline solid + 2MnCrystalline solidα
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
1904.11138.32564.9
211.57126.48284.99
952.05569.151282.5
317.35189.72427.48
per 1 mol of
105.7863.239142.49
per 1 mol of
1904.11138.32564.9
per 1 mol of
952.05569.151282.5

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]
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, (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
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]
Fe3O4 (cr)-1118.4[1]-1015.4[1]146.4[1]143.43[1]
Mn (cr)
α
0[1]0[1]32.01[1]26.32[1]
Mn (cr)
β
34.39[1]26.53[1]
Mn (cr)
γ
1.55[1]1.42[1]32.43[1]27.57[1]
Mn (g)280.7[1]238.5[1]173.70[1]20.79[1]
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (g):Gas

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)