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8NaI + 2KMnO4 + 4H2O ๐Ÿ”ฅโ†’ 8NaOH + 3I2 + 2MnO2 + 2KI

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Reaction of sodium iodide and potassium permanganate under neutral condition
8NaISodium iodide + 2KMnO4Potassium permanganate + 4H2OWater
๐Ÿ”ฅ
โŸถ
8NaOHSodium hydroxide + 3I2Iodine + 2MnO2Manganese(IV) oxide + 2KIPotassium iodide

The reaction of sodium iodide, potassium permanganate, and water yields sodium hydroxide, iodine, manganese(IV) oxide, and potassium iodide (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

Reaction of sodium iodide and potassium permanganate under neutral condition
8NaISodium iodide + 2KMnO4Potassium permanganate + 4H2OWater
๐Ÿ”ฅ
โŸถ
8NaOHSodium hydroxide + 3I2Iodine + 2MnO2Manganese(IV) oxide + 2KIPotassium iodide

General equation

Reaction of oxidizable species and oxidizing species under neutral condition
Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent + H2ONon-redox agent
โŸถ
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of sodium iodide and potassium permanganate under neutral condition

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaISodium iodide8
Reducing
Oxidizable
KMnO4Potassium permanganate2
Oxidizing
Oxidizing
H2OWater4
โ€“
Water

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaOHSodium hydroxide8
โ€“
โ€“
I2Iodine3
Oxidized
โ€“
MnO2Manganese(IV) oxide2
Reduced
โ€“
KIPotassium iodide2
โ€“
โ€“

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium iodide and potassium permanganate under neutral condition
โ—†
ฮ”rG96.2 kJ/mol
K0.14 ร— 10โˆ’16
pK16.85
8NaICrystalline solid + 2KMnO4Crystalline solid + 4H2OLiquid
๐Ÿ”ฅ
โŸถ
8NaOHCrystalline solid + 3I2Crystalline solid + 2MnO2Crystalline solid + 2KICrystalline solid
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
19.296.2โˆ’228.52โˆ’99.25
per 1 mol of
2.4012.0โˆ’28.565โˆ’12.41
9.6048.1โˆ’114.26โˆ’49.63
per 1 mol of
4.8024.1โˆ’57.130โˆ’24.81
per 1 mol of
2.4012.0โˆ’28.565โˆ’12.41
per 1 mol of
6.4032.1โˆ’76.173โˆ’33.08
9.6048.1โˆ’114.26โˆ’49.63
per 1 mol of
9.6048.1โˆ’114.26โˆ’49.63

Changes in standard condition (2)

Reaction of sodium iodide and potassium permanganate under neutral condition
8NaICrystalline solid + 2KMnO4Crystalline solid + 4H2OLiquid
๐Ÿ”ฅ
โŸถ
8NaOHCrystalline solid + 3I2Crystalline solid + 2MnO2Amorphous solidprecipitated + 2KICrystalline solid
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
54.3โ€“โ€“โ€“
per 1 mol of
6.79โ€“โ€“โ€“
27.1โ€“โ€“โ€“
per 1 mol of
13.6โ€“โ€“โ€“
per 1 mol of
6.79โ€“โ€“โ€“
per 1 mol of
18.1โ€“โ€“โ€“
27.1โ€“โ€“โ€“
per 1 mol of
27.1โ€“โ€“โ€“

Changes in aqueous solution

Reaction of sodium iodide and potassium permanganate under neutral condition
โ—†
ฮ”rG13.3 kJ/mol
K0.47 ร— 10โˆ’2
pK2.33
8NaIIonized aqueous solution + 2KMnO4Ionized aqueous solution + 4H2OLiquid
๐Ÿ”ฅ
โŸถ
8NaOHIonized aqueous solution + 3I2Un-ionized aqueous solution + 2MnO2Crystalline solid + 2KIIonized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โˆ’254.913.3โˆ’899.3โ€“
per 1 mol of
โˆ’31.861.66โˆ’112.4โ€“
โˆ’127.56.65โˆ’449.6โ€“
per 1 mol of
โˆ’63.733.33โˆ’224.8โ€“
per 1 mol of
โˆ’31.861.66โˆ’112.4โ€“
per 1 mol of
โˆ’84.974.43โˆ’299.8โ€“
โˆ’127.56.65โˆ’449.6โ€“
per 1 mol of
โˆ’127.56.65โˆ’449.6โ€“

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
NaI (cr)-287.78[1]-286.06[1]98.53[1]52.09[1]
NaI (g)-79.5[1]-121.0[1]248.978[1]36.65[1]
NaI (ai)-295.31[1]-313.47[1]170.3[1]-95.8[1]
NaI (cr)
1 hydrate
-883.096[1]-771.10[1]196.2[1]โ€“
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]
H2O (cr)โ€“โ€“โ€“โ€“
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]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (l):Liquid

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’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]โ€“
NaOH (l)
5 hydrate
-1894.31[1]-1596.34[1]386.06[1]โ€“
NaOH (l)
7 hydrate
-2469.02[1]-2073.80[1]526.31[1]โ€“
I2 (cr)0[1]0[1]116.135[1]54.438[1]
I2 (g)62.438[1]19.327[1]260.69[1]36.90[1]
I2 (ao)22.6[1]16.40[1]137.2[1]โ€“
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[1]โ€“โ€“โ€“
KI (cr)-327.900[1]-324.892[1]106.32[1]52.93[1]
KI (g)-125.5[1]-166.1[1]258.3[1]37.11[1]
KI (ai)-307.57[1]-334.85[1]213.8[1]-120.5[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (l):Liquid, (ao):Un-ionized aqueous solution, (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)