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Chemical reactions
4CaCl2 + 8KMnO4 → 4CaO + 3KClO4 + 8MnO2 + 5KCl

4CaCl₂ + 8KMnO₄ → 4CaO + 3KClO₄ + 8MnO₂ + 5KCl

Last updated: June 13, 2022

Reaction of calcium chloride and potassium permanganate: 4CaCl₂Calcium chloride + 8KMnO₄Potassium permanganate
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4CaOCalcium oxide + 3KClO₄Potassium perchlorate + 8MnO₂Manganese(IV) oxide + 5KClPotassium chloride

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

Reaction of hardly oxidizable species and oxidizing species

Table of contents

Reaction data

Chemical equation

Reaction of calcium chloride and potassium permanganate: 4CaCl₂Calcium chloride + 8KMnO₄Potassium permanganate
⟶
4CaOCalcium oxide + 3KClO₄Potassium perchlorate + 8MnO₂Manganese(IV) oxide + 5KClPotassium chloride

General equation

Reaction of hardly oxidizable species and oxidizing species: Hardly oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of calcium chloride and potassium permanganate

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
CaCl₂	Calcium chloride	4	Reducing	Hardly oxidizable
KMnO₄	Potassium permanganate	8	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
CaO	Calcium oxide	4	–	–
KClO₄	Potassium perchlorate	3	Oxidized	–
MnO₂	Manganese(IV) oxide	8	Reduced	–
KCl	Potassium chloride	5	–	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of calcium chloride and potassium permanganate ◆ Δ_rG −199.0 kJ/mol K 7.30 × 10³⁴ pK −34.86: 4CaCl₂Crystalline solid + 8KMnO₄Crystalline solid
⟶
4CaOCrystalline solid + 3KClO₄Crystalline solid + 8MnO₂Crystalline solid + 5KClCrystalline 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	−301.8	−199.0	−342.7	−32.96
per 1 mol of Calcium chloride	−75.45	−49.75	−85.67	−8.240
per 1 mol of Potassium permanganate	−37.73	−24.88	−42.84	−4.120
per 1 mol of Calcium oxide	−75.45	−49.75	−85.67	−8.240
per 1 mol of Potassium perchlorate	−100.6	−66.33	−114.2	−10.99
per 1 mol of Manganese(IV) oxide	−37.73	−24.88	−42.84	−4.120
per 1 mol of Potassium chloride	−60.36	−39.80	−68.54	−6.592

Changes in standard condition (2)

Reaction of calcium chloride and potassium permanganate: 4CaCl₂Crystalline solid + 8KMnO₄Crystalline solid
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4CaOCrystalline solid + 3KClO₄Crystalline solid + 8MnO₂Amorphous solidprecipitated + 5KClCrystalline 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	−161.5	–	–	–
per 1 mol of Calcium chloride	−40.38	–	–	–
per 1 mol of Potassium permanganate	−20.19	–	–	–
per 1 mol of Calcium oxide	−40.38	–	–	–
per 1 mol of Potassium perchlorate	−53.83	–	–	–
per 1 mol of Manganese(IV) oxide	−20.19	–	–	–
per 1 mol of Potassium chloride	−32.30	–	–	–

Changes in aqueous solution

Reaction of calcium chloride and potassium permanganate ◆ Δ_rG 23.0 kJ/mol K 0.93 × 10⁻⁴ pK 4.03: 4CaCl₂Ionized aqueous solution + 8KMnO₄Ionized aqueous solution
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4CaOCrystalline solid + 3KClO₄Ionized aqueous solution + 8MnO₂Crystalline solid + 5KClIonized 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	−84.5	23.0	−356.9	–
per 1 mol of Calcium chloride	−21.1	5.75	−89.22	–
per 1 mol of Potassium permanganate	−10.6	2.88	−44.61	–
per 1 mol of Calcium oxide	−21.1	5.75	−89.22	–
per 1 mol of Potassium perchlorate	−28.2	7.67	−119.0	–
per 1 mol of Manganese(IV) oxide	−10.6	2.88	−44.61	–
per 1 mol of Potassium chloride	−16.9	4.60	−71.38	–

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
CaCl₂ (cr)	-795.8^[1]	-748.1^[1]	104.6^[1]	72.59^[1]
CaCl₂ (g)	-471.5^[1]	-479.24^[1]	290.27^[1]	59.33^[1]
CaCl₂ (ai)	-877.13^[1]	-816.01^[1]	59.8^[1]	–
CaCl₂ (cr) 1 hydrate	-1109.2^[1]	–	–	–
CaCl₂ (cr) 2 hydrate	-1402.9^[1]	–	–	–
CaCl₂ (cr) 4 hydrate	-2009.6^[1]	–	–	–
CaCl₂ (cr) 6 hydrate	-2607.9^[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

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
CaO (cr)	-635.09^[1]	-604.03^[1]	39.75^[1]	42.80^[1]
CaO (g)	–	–	–	–
KClO₄ (cr)	-432.75^[1]	-303.09^[1]	151.0^[1]	112.38^[1]
KClO₄ (ai)	-381.71^[1]	-291.79^[1]	284.5^[1]	–
MnO₂ (cr)	-520.03^[1]	-465.14^[1]	53.05^[1]	54.14^[1]
MnO₂ (am) precipitated	-502.5^[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, (g):Gas, (ai):Ionized aqueous solution, (am):Amorphous solid

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)
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