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10NH4SCN + 10KMnO4 → 8NO↑ + 5Mn2O3 + 10KSCN + 17H2O + 2NH3↑

10NH₄SCN + 10KMnO₄ → 8NO↑ + 5Mn₂O₃ + 10KSCN + 17H₂O + 2NH₃↑

Last updated: May 12, 2022

Reaction of ammonium thiocyanate and potassium permanganate: 10NH₄SCNAmmonium thiocyanate + 10KMnO₄Potassium permanganate
⟶
8NO↑Nitrogen monoxide + 5Mn₂O₃Manganese(III) oxide + 10KSCNPotassium thiocyanate + 17H₂OWater + 2NH₃↑Ammonia

The reaction of ammonium thiocyanate and potassium permanganate yields nitrogen monoxide, manganese(III) oxide, potassium thiocyanate, water, and ammonia (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Reaction of reducing species and oxidizing species

Table of contents

Reaction data

Chemical equation

Reaction of ammonium thiocyanate and potassium permanganate: 10NH₄SCNAmmonium thiocyanate + 10KMnO₄Potassium permanganate
⟶
8NO↑Nitrogen monoxide + 5Mn₂O₃Manganese(III) oxide + 10KSCNPotassium thiocyanate + 17H₂OWater + 2NH₃↑Ammonia

General equation

Reaction of reducing species and oxidizing species: Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of ammonium thiocyanate and potassium permanganate

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
NH₄SCN	Ammonium thiocyanate	10	Reducing	Reducing
KMnO₄	Potassium permanganate	10	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
NO	Nitrogen monoxide	8	Oxidized	–
Mn₂O₃	Manganese(III) oxide	5	Reduced	–
KSCN	Potassium thiocyanate	10	–	–
H₂O	Water	17	–	–
NH₃	Ammonia	2	–	–

Thermodynamic changes

Changes in standard condition

Reaction of ammonium thiocyanate and potassium permanganate: 10NH₄SCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NO↑Gas + 5Mn₂O₃Crystalline solid + 10KSCNCrystalline solid + 17H₂OLiquid + 2NH₃↑Gas

	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	−1866.9	–	–	–
per 1 mol of Ammonium thiocyanate	−186.69	–	–	–
per 1 mol of Potassium permanganate	−186.69	–	–	–
per 1 mol of Nitrogen monoxide	−233.36	–	–	–
per 1 mol of Manganese(III) oxide	−373.38	–	–	–
per 1 mol of Potassium thiocyanate	−186.69	–	–	–
per 1 mol of Water	−109.82	–	–	–
per 1 mol of Ammonia	−933.45	–	–	–

Changes in aqueous solution (1)

Reaction of ammonium thiocyanate and potassium permanganate ◆ Δ_rG −2511.8 kJ/mol K 1.12 × 10⁴⁴⁰ pK −440.05: 10NH₄SCNIonized aqueous solution + 10KMnO₄Ionized aqueous solution
⟶
8NO↑Gas + 5Mn₂O₃Crystalline solid + 10KSCNIonized aqueous solution + 17H₂OLiquid + 2NH₃↑Gas

	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	−2285.0	−2511.8	767.0	2148.1
per 1 mol of Ammonium thiocyanate	−228.50	−251.18	76.70	214.81
per 1 mol of Potassium permanganate	−228.50	−251.18	76.70	214.81
per 1 mol of Nitrogen monoxide	−285.63	−313.98	95.88	268.51
per 1 mol of Manganese(III) oxide	−457.00	−502.36	153.4	429.62
per 1 mol of Potassium thiocyanate	−228.50	−251.18	76.70	214.81
per 1 mol of Water	−134.41	−147.75	45.12	126.36
per 1 mol of Ammonia	−1142.5	−1255.9	383.5	1074.0

Changes in aqueous solution (2)

Reaction of ammonium thiocyanate and potassium permanganate ◆ Δ_rG −2531.9 kJ/mol K 3.71 × 10⁴⁴³ pK −443.57: 10NH₄SCNIonized aqueous solution + 10KMnO₄Ionized aqueous solution
⟶
8NO↑Gas + 5Mn₂O₃Crystalline solid + 10KSCNIonized aqueous solution + 17H₂OLiquid + 2NH₃↑Un-ionized 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	−2353.4	−2531.9	604.7	–
per 1 mol of Ammonium thiocyanate	−235.34	−253.19	60.47	–
per 1 mol of Potassium permanganate	−235.34	−253.19	60.47	–
per 1 mol of Nitrogen monoxide	−294.18	−316.49	75.59	–
per 1 mol of Manganese(III) oxide	−470.68	−506.38	120.9	–
per 1 mol of Potassium thiocyanate	−235.34	−253.19	60.47	–
per 1 mol of Water	−138.44	−148.94	35.57	–
per 1 mol of Ammonia	−1176.7	−1266.0	302.4	–

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
NH₄SCN (cr)	-78.7^[1]	–	–	–
NH₄SCN (ai)	-56.07^[1]	13.40^[1]	257.7^[1]	39.7^[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, (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
NO (g)	90.25^[1]	86.55^[1]	210.761^[1]	29.844^[1]
Mn₂O₃ (cr)	-959.0^[1]	-881.1^[1]	110.5^[1]	107.65^[1]
KSCN (cr)	-200.16^[1]	-178.31^[1]	124.26^[1]	88.53^[1]
KSCN (ai)	-175.94^[1]	-190.56^[1]	246.9^[1]	-18.4^[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]
NH₃ (g)	-46.11^[1]	-16.45^[1]	192.45^[1]	35.06^[1]
NH₃ (ao)	-80.29^[1]	-26.50^[1]	111.3^[1]	–

* (g):Gas, (cr):Crystalline solid, (ai):Ionized aqueous solution, (l):Liquid, (ao):Un-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