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9HCl + 4NaMnO4 + 8H+ 🔥→ 5HClO2 + 4Mn2+ + 4NaCl + 6H2O

Reaction of hydrogen chloride and sodium permanganate under acidic condition
9HClHydrogen chloride + 4NaMnO4Sodium permanganate + 8H+Hydrogen ion
🔥
5HClO2Chlorous acid + 4Mn2+Manganese(II) ion + 4NaClSodium chloride + 6H2OWater

The reaction of hydrogen chloride, sodium permanganate, and hydrogen ion yields chlorous acid, manganese(II) ion, sodium chloride, and water (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 hydrogen chloride and sodium permanganate under acidic condition
9HClHydrogen chloride + 4NaMnO4Sodium permanganate + 8H+Hydrogen ion
🔥
5HClO2Chlorous acid + 4Mn2+Manganese(II) ion + 4NaClSodium chloride + 6H2OWater

General equation

Reaction of hardly oxidizable species and oxidizing species under acidic condition
Hardly oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent + H+Non-redox agent
ProductOxidation product + ProductReduction product + H2ONon-redox product

Oxidation state of each atom

Reaction of hydrogen chloride and sodium permanganate under acidic condition

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
HClHydrogen chloride9
Reducing
Hardly oxidizable
NaMnO4Sodium permanganate4
Oxidizing
Oxidizing under acidic condition
H+Hydrogen ion8
Hydrogen ion

Products

Chemical formulaNameCoefficientTypeType in general
equation
HClO2Chlorous acid5
Oxidized
Mn2+Manganese(II) ion4
Reduced
NaClSodium chloride4
H2OWater6
Water

Thermodynamic changes

Changes in standard condition

Reaction of hydrogen chloride and sodium permanganate under acidic condition
ΔrG139.2 kJ/mol
K0.41 × 10−24
pK24.39
9HClIonized aqueous solution + 4NaMnO4Ionized aqueous solution + 8H+Un-ionized aqueous solution
🔥
5HClO2Un-ionized aqueous solution + 4Mn2+Un-ionized aqueous solution + 4NaClIonized aqueous solution + 6H2OLiquid
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
144.3139.219.3
per 1 mol of
16.0315.472.14
36.0834.804.83
per 1 mol of
Hydrogen ion
18.0417.402.41
per 1 mol of
28.8627.843.86
per 1 mol of
Manganese(II) ion
36.0834.804.83
per 1 mol of
36.0834.804.83
per 1 mol of
24.0523.203.22

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
HCl (g)-92.307[1]-95.299[1]186.908[1]29.12[1]
HCl (ai)-167.159[1]-131.228[1]56.5[1]-136.4[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]
H+ (g)1536.202[1]
H+ (ao)0[1]0[1]0[1]0[1]
* (g):Gas, (ai):Ionized aqueous solution, (cr):Crystalline solid, (ao):Un-ionized aqueous solution

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
HClO2 (ao)-51.9[1]5.9[1]188.3[1]
Mn2+ (g)2519.69[1]
Mn2+ (ao)-220.75[1]-228.1[1]-73.6[1]50[1]
NaCl (cr)-411.153[1]-384.138[1]72.13[1]50.50[1]
NaCl (g)-176.65[1]-196.66[1]229.81[1]35.77[1]
NaCl (ai)-407.27[1]-393.133[1]115.5[1]-90.0[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]
* (ao):Un-ionized aqueous solution, (g):Gas, (cr):Crystalline solid, (ai):Ionized aqueous solution, (l):Liquid

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)