You-iggy
  1. Home
  2. Chemical reactions
  3. Se + 2KMnO4 → K2SeO4 + 2MnO2

Se + 2KMnO4 → K2SeO4 + 2MnO2

Last updated:
Reaction of selenium and potassium permanganate
SeSelenium + 2KMnO4Potassium permanganate
⟶
K2SeO4Potassium selenate + 2MnO2Manganese(IV) oxide

The reaction of selenium and potassium permanganate yields potassium selenate 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

Reaction of selenium and potassium permanganate
SeSelenium + 2KMnO4Potassium permanganate
⟶
K2SeO4Potassium selenate + 2MnO2Manganese(IV) oxide

General equation

Reaction of oxidizable species and oxidizing species
Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of selenium and potassium permanganate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
SeSelenium1
Reducing
Oxidizable
KMnO4Potassium permanganate2
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
K2SeO4Potassium selenate1
Oxidized
–
MnO2Manganese(IV) oxide2
Reduced
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of selenium and potassium permanganate
◆
ΔrG−457.9 kJ/mol
K1.66 × 1080
pK−80.22
SeCrystalline solidhexagonal, gray + 2KMnO4Crystalline solid
⟶
K2SeO4Crystalline solid + 2MnO2Crystalline 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
−475.7−457.9−58–
per 1 mol of
−475.7−457.9−58–
−237.8−228.9−29–
per 1 mol of
−475.7−457.9−58–
−237.8−228.9−29–

Changes in standard condition (2)

Reaction of selenium and potassium permanganate
SeCrystalline solidhexagonal, gray + 2KMnO4Crystalline solid
⟶
K2SeO4Crystalline solid + 2MnO2Amorphous solidprecipitated
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
−440.6–––
per 1 mol of
−440.6–––
−220.3–––
per 1 mol of
−440.6–––
−220.3–––

Changes in standard condition (3)

Reaction of selenium and potassium permanganate
SeCrystalline solidmonoclinic, red + 2KMnO4Crystalline solid
⟶
K2SeO4Crystalline solid + 2MnO2Crystalline 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
−482.4–––
per 1 mol of
−482.4–––
−241.2–––
per 1 mol of
−482.4–––
−241.2–––

Changes in standard condition (4)

Reaction of selenium and potassium permanganate
SeCrystalline solidmonoclinic, red + 2KMnO4Crystalline solid
⟶
K2SeO4Crystalline solid + 2MnO2Amorphous solidprecipitated
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
−447.3–––
per 1 mol of
−447.3–––
−223.7–––
per 1 mol of
−447.3–––
−223.7–––

Changes in aqueous solution

Reaction of selenium and potassium permanganate
◆
ΔrG−477.2 kJ/mol
K4.00 × 1083
pK−83.60
SeCrystalline solidhexagonal, gray + 2KMnO4Ionized aqueous solution
⟶
K2SeO4Ionized aqueous solution + 2MnO2Crystalline 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
−556.2−477.2−264.7–
per 1 mol of
−556.2−477.2−264.7–
−278.1−238.6−132.3–
per 1 mol of
−556.2−477.2−264.7–
−278.1−238.6−132.3–

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
Se (cr)
hexagonal, gray
0[1]0[1]42.442[1]25.363[1]
Se (cr)
monoclinic, red
6.7[1]–––
Se (vit)5.0[1]–––
Se (g)227.07[1]187.03[1]176.72[1]20.820[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]
* (cr):Crystalline solid, (vit):Vitreous liquid, (g):Gas, (ai):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
K2SeO4 (cr)-1110.02[1]-1002.8[1]222[1]–
K2SeO4 (ai)-1103.7[1]-1007.9[1]259.0[1]–
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[1]–––
* (cr):Crystalline solid, (ai):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)