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2Na + KSCN → Na2S + KCN

The reaction of sodium and potassium thiocyanate yields sodium sulfide and potassium cyanide (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

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaSodium2
Reducing
Reducing
KSCNPotassium thiocyanate1
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na2SSodium sulfide1
Oxidized
KCNPotassium cyanide1
Reduced

Thermodynamic changes

Changes in standard condition

Reaction of sodium and potassium thiocyanate
ΔrG−273.4 kJ/mol
K7.90 × 1047
pK−47.90
2NaCrystalline solid + KSCNCrystalline solid
Na2SCrystalline solid + KCNCrystalline solid
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
−277.6−273.4−14.5
per 1 mol of
−138.8−136.7−7.25
−277.6−273.4−14.5
per 1 mol of
−277.6−273.4−14.5
per 1 mol of
−277.6−273.4−14.5

Changes in aqueous solution

Reaction of sodium and potassium thiocyanate
ΔrG−358.4 kJ/mol
K6.15 × 1062
pK−62.79
2NaCrystalline solid + KSCNIonized aqueous solution
Na2SIonized aqueous solution + KCNIonized 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
−373.1−358.4−49.4
per 1 mol of
−186.6−179.2−24.7
−373.1−358.4−49.4
per 1 mol of
−373.1−358.4−49.4
per 1 mol of
−373.1−358.4−49.4

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
Na (cr)0[1]0[1]51.21[1]28.24[1]
Na (g)107.32[1]76.761[1]153.712[1]20.786[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]
* (cr):Crystalline solid, (g):Gas, (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
Na2S (cr)-364.8[1]-349.8[1]83.7[1]
Na2S (ai)-447.3[1]-438.1[1]103.3[1]
Na2S (cr)
4.5 hydrate
-1725.9[1]
Na2S (cr)
5 hydrate
-1886.6[1]
Na2S (cr)
9 hydrate
-3074.0[1]
KCN (cr)-113.0[1]-101.86[1]128.49[1]66.27[1]
KCN (g)90.8[1]64.17[1]261.90[1]52.34[1]
KCN (ai)-101.7[1]-110.9[1]196.6[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas

References

List of references

  1. 1