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2NaMnO4 + 8H2O 💧⚡→ 2NaOH + 2Mn(OH)2 + 5H2O2

Electrolysis of aqueous sodium permanganate yields sodium hydroxide, manganese(II) hydroxide, and hydrogen peroxide (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

Electrolysis of aqueous solution with water as reducing agent
Miscible with water/Very soluble in water/Soluble in waterOxidizing agent + H2OReducing agent
💧⚡
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Electrolysis of aqueous sodium permanganate with water as reducing agent

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaMnO4Sodium permanganate2
Oxidizing
Very soluble in water
H2OWater8
Reducing
Water

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaOHSodium hydroxide2
Mn(OH)2Manganese(II) hydroxide2
Reduced
H2O2Hydrogen peroxide5
Oxidized

Thermodynamic changes

Changes in aqueous solution

Electrolysis of aqueous sodium permanganate with water as reducing agent
ΔrG576.8 kJ/mol
K0.89 × 10−101
pK101.05
2NaMnO4Ionized aqueous solution + 8H2OLiquid
💧⚡
2NaOHIonized aqueous solution + 2Mn(OH)2Amorphous solidprecipitated + 5H2O2Un-ionized 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
563.0576.8−45.6
281.5288.4−22.8
per 1 mol of
70.3872.10−5.70
per 1 mol of
281.5288.4−22.8
281.5288.4−22.8
per 1 mol of
112.6115.4−9.12

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
NaMnO4 (ai)-781.6[1]-709.1[1]250.2[1]
NaMnO4 (cr)
1 hydrate
-1079.14[1]
NaMnO4 (cr)
3 hydrate
-1672.85[1]
H2O (cr)
H2O (l)-285.830[1]-237.129[1]69.91[1]75.291[1]
H2O (g)-241.818[1]-228.572[1]188.825[1]33.577[1]
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (l):Liquid, (g):Gas

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
NaOH (cr)-425.609[1]-379.494[1]64.455[1]59.54[1]
NaOH (g)-207.1[1]-210.0[1]228.43[1]48.37[1]
NaOH (ai)-470.114[1]-419.150[1]48.1[1]-102.1[1]
NaOH (cr)
1 hydrate
-734.543[1]-629.338[1]99.50[1]90.17[1]
NaOH (l)
2 hydrate
-1019.076[1]-873.091[1]195.979[1]239.41[1]
NaOH (l)
3.5 hydrate
-1459.798[1]-1236.356[1]286.089[1]354.43[1]
NaOH (l)
4 hydrate
-1605.15[1]-1356.64[1]318.70[1]
NaOH (l)
5 hydrate
-1894.31[1]-1596.34[1]386.06[1]
NaOH (l)
7 hydrate
-2469.02[1]-2073.80[1]526.31[1]
Mn(OH)2 (am)
precipitated
-695.4[1]-615.0[1]99.2[1]
H2O2 (l)-187.78[1]-120.35[1]109.6[1]89.1[1]
H2O2 (g)-136.31[1]-105.57[1]232.7[1]43.1[1]
H2O2 (ao)-191.17[1]-134.03[1]143.9[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (l):Liquid, (am):Amorphous solid, (ao):Un-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)