Home
Chemical reactions
8NaSCN + 10KMnO4 → 8NaNO2 + S + 8MnCO3 + 2MnS + 5K2S

8NaSCN + 10KMnO₄ → 8NaNO₂ + S + 8MnCO₃ + 2MnS + 5K₂S

Last updated: May 12, 2022

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNSodium thiocyanate + 10KMnO₄Potassium permanganate
⟶
8NaNO₂Sodium nitrite + SSulfur + 8MnCO₃Manganese(II) carbonate + 2MnSManganese(II) sulfide + 5K₂SPotassium sulfide

The reaction of sodium thiocyanate and potassium permanganate yields sodium nitrite, sulfur, manganese(II) carbonate, manganese(II) sulfide, and potassium sulfide (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 sodium thiocyanate and potassium permanganate: 8NaSCNSodium thiocyanate + 10KMnO₄Potassium permanganate
⟶
8NaNO₂Sodium nitrite + SSulfur + 8MnCO₃Manganese(II) carbonate + 2MnSManganese(II) sulfide + 5K₂SPotassium sulfide

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 sodium thiocyanate and potassium permanganate

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
NaSCN	Sodium thiocyanate	8	Reducing	Reducing
KMnO₄	Potassium permanganate	10	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
NaNO₂	Sodium nitrite	8	Oxidized	–
S	Sulfur	1	Oxidized	–
MnCO₃	Manganese(II) carbonate	8	Reduced	–
MnS	Manganese(II) sulfide	2	Reduced	–
K₂S	Potassium sulfide	5	–	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidrhombic + 8MnCO₃Crystalline solidnatural + 2MnSCrystalline solidgreen + 5K₂SCrystalline 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	−2617.9	–	–	–
per 1 mol of Sodium thiocyanate	−327.24	–	–	–
per 1 mol of Potassium permanganate	−261.79	–	–	–
per 1 mol of Sodium nitrite	−327.24	–	–	–
per 1 mol of Sulfur	−2617.9	–	–	–
per 1 mol of Manganese(II) carbonate	−327.24	–	–	–
per 1 mol of Manganese(II) sulfide	−1309.0	–	–	–
per 1 mol of Potassium sulfide	−523.58	–	–	–

Changes in standard condition (2)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidrhombic + 8MnCO₃Crystalline solidnatural + 2MnSAmorphous solidprecipitated, pink + 5K₂SCrystalline 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	−2617.1	–	–	–
per 1 mol of Sodium thiocyanate	−327.14	–	–	–
per 1 mol of Potassium permanganate	−261.71	–	–	–
per 1 mol of Sodium nitrite	−327.14	–	–	–
per 1 mol of Sulfur	−2617.1	–	–	–
per 1 mol of Manganese(II) carbonate	−327.14	–	–	–
per 1 mol of Manganese(II) sulfide	−1308.5	–	–	–
per 1 mol of Potassium sulfide	−523.42	–	–	–

Changes in standard condition (3)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidrhombic + 8MnCO₃Crystalline solidprecipitated + 2MnSCrystalline solidgreen + 5K₂SCrystalline 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	−2530.7	–	–	–
per 1 mol of Sodium thiocyanate	−316.34	–	–	–
per 1 mol of Potassium permanganate	−253.07	–	–	–
per 1 mol of Sodium nitrite	−316.34	–	–	–
per 1 mol of Sulfur	−2530.7	–	–	–
per 1 mol of Manganese(II) carbonate	−316.34	–	–	–
per 1 mol of Manganese(II) sulfide	−1265.3	–	–	–
per 1 mol of Potassium sulfide	−506.14	–	–	–

Changes in standard condition (4)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidrhombic + 8MnCO₃Crystalline solidprecipitated + 2MnSAmorphous solidprecipitated, pink + 5K₂SCrystalline 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	−2529.9	–	–	–
per 1 mol of Sodium thiocyanate	−316.24	–	–	–
per 1 mol of Potassium permanganate	−252.99	–	–	–
per 1 mol of Sodium nitrite	−316.24	–	–	–
per 1 mol of Sulfur	−2529.9	–	–	–
per 1 mol of Manganese(II) carbonate	−316.24	–	–	–
per 1 mol of Manganese(II) sulfide	−1265.0	–	–	–
per 1 mol of Potassium sulfide	−505.98	–	–	–

Changes in standard condition (5)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidmonoclinic + 8MnCO₃Crystalline solidnatural + 2MnSCrystalline solidgreen + 5K₂SCrystalline 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	−2617.6	–	–	–
per 1 mol of Sodium thiocyanate	−327.20	–	–	–
per 1 mol of Potassium permanganate	−261.76	–	–	–
per 1 mol of Sodium nitrite	−327.20	–	–	–
per 1 mol of Sulfur	−2617.6	–	–	–
per 1 mol of Manganese(II) carbonate	−327.20	–	–	–
per 1 mol of Manganese(II) sulfide	−1308.8	–	–	–
per 1 mol of Potassium sulfide	−523.52	–	–	–

Changes in standard condition (6)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidmonoclinic + 8MnCO₃Crystalline solidnatural + 2MnSAmorphous solidprecipitated, pink + 5K₂SCrystalline 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	−2616.8	–	–	–
per 1 mol of Sodium thiocyanate	−327.10	–	–	–
per 1 mol of Potassium permanganate	−261.68	–	–	–
per 1 mol of Sodium nitrite	−327.10	–	–	–
per 1 mol of Sulfur	−2616.8	–	–	–
per 1 mol of Manganese(II) carbonate	−327.10	–	–	–
per 1 mol of Manganese(II) sulfide	−1308.4	–	–	–
per 1 mol of Potassium sulfide	−523.36	–	–	–

Changes in standard condition (7)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidmonoclinic + 8MnCO₃Crystalline solidprecipitated + 2MnSCrystalline solidgreen + 5K₂SCrystalline 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	−2530.4	–	–	–
per 1 mol of Sodium thiocyanate	−316.30	–	–	–
per 1 mol of Potassium permanganate	−253.04	–	–	–
per 1 mol of Sodium nitrite	−316.30	–	–	–
per 1 mol of Sulfur	−2530.4	–	–	–
per 1 mol of Manganese(II) carbonate	−316.30	–	–	–
per 1 mol of Manganese(II) sulfide	−1265.2	–	–	–
per 1 mol of Potassium sulfide	−506.08	–	–	–

Changes in standard condition (8)

Reaction of sodium thiocyanate and potassium permanganate: 8NaSCNCrystalline solid + 10KMnO₄Crystalline solid
⟶
8NaNO₂Crystalline solid + SCrystalline solidmonoclinic + 8MnCO₃Crystalline solidprecipitated + 2MnSAmorphous solidprecipitated, pink + 5K₂SCrystalline 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	−2529.6	–	–	–
per 1 mol of Sodium thiocyanate	−316.20	–	–	–
per 1 mol of Potassium permanganate	−252.96	–	–	–
per 1 mol of Sodium nitrite	−316.20	–	–	–
per 1 mol of Sulfur	−2529.6	–	–	–
per 1 mol of Manganese(II) carbonate	−316.20	–	–	–
per 1 mol of Manganese(II) sulfide	−1264.8	–	–	–
per 1 mol of Potassium sulfide	−505.92	–	–	–

Changes in aqueous solution

Reaction of sodium thiocyanate and potassium permanganate ◆ Δ_rG −3068.3 kJ/mol K 3.49 × 10⁵³⁷ pK −537.54: 8NaSCNIonized aqueous solution + 10KMnO₄Ionized aqueous solution
⟶
8NaNO₂Ionized aqueous solution + SCrystalline solidrhombic + 8MnCO₃Crystalline solidnatural + 2MnSCrystalline solidgreen + 5K₂SIonized 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	−3449.7	−3068.3	−1280.8	–
per 1 mol of Sodium thiocyanate	−431.21	−383.54	−160.10	–
per 1 mol of Potassium permanganate	−344.97	−306.83	−128.08	–
per 1 mol of Sodium nitrite	−431.21	−383.54	−160.10	–
per 1 mol of Sulfur	−3449.7	−3068.3	−1280.8	–
per 1 mol of Manganese(II) carbonate	−431.21	−383.54	−160.10	–
per 1 mol of Manganese(II) sulfide	−1724.8	−1534.2	−640.40	–
per 1 mol of Potassium sulfide	−689.94	−613.66	−256.16	–

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
NaSCN (cr)	-170.50^[1]	–	–	–
NaSCN (ai)	-163.68^[1]	-169.18^[1]	203.3^[1]	6.3^[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, (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
NaNO₂ (cr)	-358.65^[1]	-284.55^[1]	103.8^[1]	–
NaNO₂ (ai)	-344.8^[1]	-294.1^[1]	182.0^[1]	-51.0^[1]
S (cr) rhombic	0^[1]	0^[1]	31.80^[1]	22.64^[1]
S (cr) monoclinic	0.33^[1]	–	–	–
S (g)	278.805^[1]	238.250^[1]	167.821^[1]	23.673^[1]
MnCO₃ (cr) natural	-894.1^[1]	-816.7^[1]	85.8^[1]	81.50^[1]
MnCO₃ (cr) precipitated	-883.2^[1]	–	–	–
MnS (cr) green	-214.2^[1]	-218.4^[1]	78.2^[1]	49.96^[1]
MnS (am) precipitated, pink	-213.8^[1]	–	–	–
K₂S (cr)	-380.7^[1]	-364.0^[1]	105^[1]	–
K₂S (ai)	-471.5^[1]	-480.7^[1]	190.4^[1]	–
K₂S (cr) 2 hydrate	-975.3^[1]	–	–	–
K₂S (cr) 5 hydrate	-1871.5^[1]	–	–	–

* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (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)
Citation list