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NaSCN + 2KMnO4 → NaNO2 + 2MnO2 + K2S + CO2↑

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Reaction of sodium thiocyanate and potassium permanganate
NaSCNSodium thiocyanate + 2KMnO4Potassium permanganate
⟶
NaNO2Sodium nitrite + 2MnO2Manganese(IV) oxide + K2SPotassium sulfide + CO2↑Carbon dioxide

The reaction of sodium thiocyanate and potassium permanganate yields sodium nitrite, manganese(IV) oxide, potassium sulfide, and carbon dioxide (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 sodium thiocyanate and potassium permanganate
NaSCNSodium thiocyanate + 2KMnO4Potassium permanganate
⟶
NaNO2Sodium nitrite + 2MnO2Manganese(IV) oxide + K2SPotassium sulfide + CO2↑Carbon dioxide

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 formulaNameCoefficientTypeType in general
equation
NaSCNSodium thiocyanate1
Reducing
Reducing
KMnO4Potassium permanganate2
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaNO2Sodium nitrite1
Oxidized
–
MnO2Manganese(IV) oxide2
Reduced
–
K2SPotassium sulfide1
–
–
CO2Carbon dioxide1
–
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium thiocyanate and potassium permanganate
NaSCNCrystalline solid + 2KMnO4Crystalline solid
⟶
NaNO2Crystalline solid + 2MnO2Crystalline solid + K2SCrystalline solid + CO2↑Gas
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
−328.0–––
per 1 mol of
−328.0–––
−164.0–––
per 1 mol of
−328.0–––
−164.0–––
per 1 mol of
−328.0–––
per 1 mol of
−328.0–––

Changes in standard condition (2)

Reaction of sodium thiocyanate and potassium permanganate
NaSCNCrystalline solid + 2KMnO4Crystalline solid
⟶
NaNO2Crystalline solid + 2MnO2Amorphous solidprecipitated + K2SCrystalline solid + CO2↑Gas
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
−293.0–––
per 1 mol of
−293.0–––
−146.5–––
per 1 mol of
−293.0–––
−146.5–––
per 1 mol of
−293.0–––
per 1 mol of
−293.0–––

Changes in aqueous solution (1)

Reaction of sodium thiocyanate and potassium permanganate
◆
ΔrG−469.3 kJ/mol
K1.65 × 1082
pK−82.22
NaSCNIonized aqueous solution + 2KMnO4Ionized aqueous solution
⟶
NaNO2Ionized aqueous solution + 2MnO2Crystalline solid + K2SIonized aqueous solution + CO2↑Gas
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
−498.6−469.3−98.5–
per 1 mol of
−498.6−469.3−98.5–
−249.3−234.7−49.3–
per 1 mol of
−498.6−469.3−98.5–
−249.3−234.7−49.3–
per 1 mol of
−498.6−469.3−98.5–
per 1 mol of
−498.6−469.3−98.5–

Changes in aqueous solution (2)

Reaction of sodium thiocyanate and potassium permanganate
◆
ΔrG−460.9 kJ/mol
K5.57 × 1080
pK−80.75
NaSCNIonized aqueous solution + 2KMnO4Ionized aqueous solution
⟶
NaNO2Ionized aqueous solution + 2MnO2Crystalline solid + K2SIonized aqueous solution + CO2↑Un-ionized aqueous solution
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
−518.9−460.9−194.6–
per 1 mol of
−518.9−460.9−194.6–
−259.4−230.4−97.30–
per 1 mol of
−518.9−460.9−194.6–
−259.4−230.4−97.30–
per 1 mol of
−518.9−460.9−194.6–
per 1 mol of
−518.9−460.9−194.6–

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
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 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
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]
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[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]–––
CO2 (g)-393.509[1]-394.359[1]213.74[1]37.11[1]
CO2 (ao)-413.80[1]-385.98[1]117.6[1]–
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (am):Amorphous solid, (g):Gas, (ao):Un-ionized aqueous solution

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)