Home
Chemical reactions
2MnCl2 + 2KMnO4 → 4MnO2 + Cl2↑ + 2KCl

2MnCl₂ + 2KMnO₄ → 4MnO₂ + Cl₂↑ + 2KCl

Last updated: June 13, 2022

Reaction of manganese(II) chloride and potassium permanganate: 2MnCl₂Manganese(II) chloride + 2KMnO₄Potassium permanganate
⟶
4MnO₂Manganese(IV) oxide + Cl₂↑Chlorine + 2KClPotassium chloride

The reaction of manganese(II) chloride and potassium permanganate yields manganese(IV) oxide, chlorine, and potassium chloride (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Reaction of oxidizable species and oxidizing species

Table of contents

Reaction data

Chemical equation

Reaction of manganese(II) chloride and potassium permanganate: 2MnCl₂Manganese(II) chloride + 2KMnO₄Potassium permanganate
⟶
4MnO₂Manganese(IV) oxide + Cl₂↑Chlorine + 2KClPotassium chloride

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 manganese(II) chloride and potassium permanganate

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
MnCl₂	Manganese(II) chloride	2	Reducing	Oxidizable
KMnO₄	Potassium permanganate	2	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
MnO₂	Manganese(IV) oxide	4	Redoxed product	–
Cl₂	Chlorine	1	Oxidized	–
KCl	Potassium chloride	2	–	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of manganese(II) chloride and potassium permanganate ◆ Δ_rG −322.6 kJ/mol K 3.29 × 10⁵⁶ pK −56.52: 2MnCl₂Crystalline solid + 2KMnO₄Crystalline solid
⟶
4MnO₂Crystalline solid + Cl₂↑Gas + 2KClCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−316.6	−322.6	20.55	−27.93
per 1 mol of Manganese(II) chloride	−158.3	−161.3	10.28	−13.96
per 1 mol of Potassium permanganate	−158.3	−161.3	10.28	−13.96
per 1 mol of Manganese(IV) oxide	−79.15	−80.65	5.138	−6.982
per 1 mol of Chlorine	−316.6	−322.6	20.55	−27.93
per 1 mol of Potassium chloride	−158.3	−161.3	10.28	−13.96

Changes in standard condition (2)

Reaction of manganese(II) chloride and potassium permanganate: 2MnCl₂Crystalline solid + 2KMnO₄Crystalline solid
⟶
4MnO₂Amorphous solidprecipitated + Cl₂↑Gas + 2KClCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−246.5	–	–	–
per 1 mol of Manganese(II) chloride	−123.3	–	–	–
per 1 mol of Potassium permanganate	−123.3	–	–	–
per 1 mol of Manganese(IV) oxide	−61.63	–	–	–
per 1 mol of Chlorine	−246.5	–	–	–
per 1 mol of Potassium chloride	−123.3	–	–	–

Changes in aqueous solution (1)

Reaction of manganese(II) chloride and potassium permanganate ◆ Δ_rG −246.9 kJ/mol K 1.80 × 10⁴³ pK −43.26: 2MnCl₂Ionized aqueous solution + 2KMnO₄Ionized aqueous solution
⟶
4MnO₂Crystalline solid + Cl₂↑Gas + 2KClIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−221.5	−246.9	88.1	586
per 1 mol of Manganese(II) chloride	−110.8	−123.5	44.0	293
per 1 mol of Potassium permanganate	−110.8	−123.5	44.0	293
per 1 mol of Manganese(IV) oxide	−55.38	−61.73	22.0	147
per 1 mol of Chlorine	−221.5	−246.9	88.1	586
per 1 mol of Potassium chloride	−110.8	−123.5	44.0	293

Changes in aqueous solution (2)

Reaction of manganese(II) chloride and potassium permanganate ◆ Δ_rG −240.0 kJ/mol K 1.11 × 10⁴² pK −42.05: 2MnCl₂Ionized aqueous solution + 2KMnO₄Ionized aqueous solution
⟶
4MnO₂Crystalline solid + Cl₂↑Un-ionized aqueous solution + 2KClIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−244.9	−240.0	−14	–
per 1 mol of Manganese(II) chloride	−122.5	−120.0	−7.0	–
per 1 mol of Potassium permanganate	−122.5	−120.0	−7.0	–
per 1 mol of Manganese(IV) oxide	−61.23	−60.00	−3.5	–
per 1 mol of Chlorine	−244.9	−240.0	−14	–
per 1 mol of Potassium chloride	−122.5	−120.0	−7.0	–

Changes in aqueous solution (3)

Reaction of manganese(II) chloride and potassium permanganate ◆ Δ_rG −244.5 kJ/mol K 6.83 × 10⁴² pK −42.83: 2MnCl₂Un-ionized aqueous solution + 2KMnO₄Ionized aqueous solution
⟶
4MnO₂Crystalline solid + Cl₂↑Gas + 2KClIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	−244.5	–	–
per 1 mol of Manganese(II) chloride	–	−122.3	–	–
per 1 mol of Potassium permanganate	–	−122.3	–	–
per 1 mol of Manganese(IV) oxide	–	−61.13	–	–
per 1 mol of Chlorine	–	−244.5	–	–
per 1 mol of Potassium chloride	–	−122.3	–	–

Changes in aqueous solution (4)

Reaction of manganese(II) chloride and potassium permanganate ◆ Δ_rG −237.6 kJ/mol K 4.22 × 10⁴¹ pK −41.63: 2MnCl₂Un-ionized aqueous solution + 2KMnO₄Ionized aqueous solution
⟶
4MnO₂Crystalline solid + Cl₂↑Un-ionized aqueous solution + 2KClIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	−237.6	–	–
per 1 mol of Manganese(II) chloride	–	−118.8	–	–
per 1 mol of Potassium permanganate	–	−118.8	–	–
per 1 mol of Manganese(IV) oxide	–	−59.40	–	–
per 1 mol of Chlorine	–	−237.6	–	–
per 1 mol of Potassium chloride	–	−118.8	–	–

Thermodynamic data of reactants

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
MnCl₂ (cr)	-481.29^[1]	-440.50^[1]	118.24^[1]	72.93^[1]
MnCl₂ (g)	-263.6^[1]	–	–	–
MnCl₂ (ai)	-555.05^[1]	-490.8^[1]	38.9^[1]	-222^[1]
MnCl₂ (ao)	–	-492.0^[1]	–	–
MnCl₂ (cr) 1 hydrate	-789.9^[1]	-696.1^[1]	174.1^[1]	–
MnCl₂ (cr) 2 hydrate	-1092.0^[1]	-942.1^[1]	218.8^[1]	–
MnCl₂ (cr) 4 hydrate	-1687.4^[1]	-1423.6^[1]	303.3^[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, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

Thermodynamic data of products

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
MnO₂ (cr)	-520.03^[1]	-465.14^[1]	53.05^[1]	54.14^[1]
MnO₂ (am) precipitated	-502.5^[1]	–	–	–
Cl₂ (g)	0^[1]	0^[1]	223.066^[1]	33.907^[1]
Cl₂ (ao)	-23.4^[1]	6.94^[1]	121^[1]	–
KCl (cr)	-436.747^[1]	-409.14^[1]	82.59^[1]	51.30^[1]
KCl (g)	-214.14^[1]	-233.0^[1]	239.10^[1]	36.48^[1]
KCl (ai)	-419.53^[1]	-414.49^[1]	159.0^[1]	-114.6^[1]

* (cr):Crystalline solid, (am):Amorphous solid, (g):Gas, (ao):Un-ionized aqueous solution, (ai):Ionized aqueous solution

References

List of references

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
https://doi.org/10.18434/M32124
National Institute of Standards and Technology (NIST)
Citation list

Δ_rG	−322.6 kJ/mol
K	3.29 × 10⁵⁶
pK	−56.52

Δ_rG	−246.9 kJ/mol
K	1.80 × 10⁴³
pK	−43.26

Δ_rG	−240.0 kJ/mol
K	1.11 × 10⁴²
pK	−42.05

Δ_rG	−244.5 kJ/mol
K	6.83 × 10⁴²
pK	−42.83

2MnCl2 + 2KMnO4 → 4MnO2 + Cl2↑ + 2KCl

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Products

Thermodynamic changes

Changes in standard condition (1)

Changes in standard condition (2)

Changes in aqueous solution (1)

Changes in aqueous solution (2)

Changes in aqueous solution (3)

Changes in aqueous solution (4)

Thermodynamic data of reactants

Thermodynamic data of products

References

List of references

Related reactions

Reactions with same reactants

Related categories

Type of reaction

General equation

Reactant

Product

2MnCl₂ + 2KMnO₄ → 4MnO₂ + Cl₂↑ + 2KCl