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8Na + 10HSCN → 8NaSCN + (NH4)2S + H2S↑ + 2C

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Reaction of sodium and thiocyanic acid
8NaSodium + 10HSCNThiocyanic acid
⟶
8NaSCNSodium thiocyanate + (NH4)2SAmmonium sulfide + H2S↑Hydrogen sulfide + 2CCarbon

The reaction of sodium and thiocyanic acid yields sodium thiocyanate, ammonium sulfide, hydrogen sulfide, and carbon (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 and thiocyanic acid
8NaSodium + 10HSCNThiocyanic acid
⟶
8NaSCNSodium thiocyanate + (NH4)2SAmmonium sulfide + H2S↑Hydrogen sulfide + 2CCarbon

General equation

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

Oxidation state of each atom

Reaction of sodium and thiocyanic acid

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaSodium8
Reducing
Reducing
HSCNThiocyanic acid10
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaSCNSodium thiocyanate8
Oxidized
–
(NH4)2SAmmonium sulfide1
–
–
H2SHydrogen sulfide1
–
–
CCarbon2
Reduced
–

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of sodium and thiocyanic acid
◆
ΔrG−2386.7 kJ/mol
K1.35 × 10418
pK−418.13
8NaCrystalline solid + 10HSCNIonized aqueous solution
⟶
8NaSCNIonized aqueous solution + (NH4)2SIonized aqueous solution + H2S↑Gas + 2CCrystalline solidgraphite
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
−2326.3−2386.7203.1–
per 1 mol of
−290.79−298.3425.39–
per 1 mol of
−232.63−238.6720.31–
per 1 mol of
−290.79−298.3425.39–
per 1 mol of
−2326.3−2386.7203.1–
per 1 mol of
−2326.3−2386.7203.1–
per 1 mol of
−1163.2−1193.3101.5–

Changes in aqueous solution (2)

Reaction of sodium and thiocyanic acid
◆
ΔrG−2381.0 kJ/mol
K1.36 × 10417
pK−417.13
8NaCrystalline solid + 10HSCNIonized aqueous solution
⟶
8NaSCNIonized aqueous solution + (NH4)2SIonized aqueous solution + H2S↑Un-ionized aqueous solution + 2CCrystalline solidgraphite
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
−2345.3−2381.0118–
per 1 mol of
−293.16−297.6314.8–
per 1 mol of
−234.53−238.1011.8–
per 1 mol of
−293.16−297.6314.8–
per 1 mol of
−2345.3−2381.0118–
per 1 mol of
−2345.3−2381.0118–
per 1 mol of
−1172.7−1190.559.0–

Changes in aqueous solution (3)

Reaction of sodium and thiocyanic acid
◆
ΔrG−2435.2 kJ/mol
K4.25 × 10426
pK−426.63
8NaCrystalline solid + 10HSCNUn-ionized aqueous solution
⟶
8NaSCNIonized aqueous solution + (NH4)2SIonized aqueous solution + H2S↑Gas + 2CCrystalline solidgraphite
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
–−2435.2––
per 1 mol of
–−304.40––
per 1 mol of
–−243.52––
per 1 mol of
–−304.40––
per 1 mol of
–−2435.2––
per 1 mol of
–−2435.2––
per 1 mol of
–−1217.6––

Changes in aqueous solution (4)

Reaction of sodium and thiocyanic acid
◆
ΔrG−2429.5 kJ/mol
K4.27 × 10425
pK−425.63
8NaCrystalline solid + 10HSCNUn-ionized aqueous solution
⟶
8NaSCNIonized aqueous solution + (NH4)2SIonized aqueous solution + H2S↑Un-ionized aqueous solution + 2CCrystalline solidgraphite
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
–−2429.5––
per 1 mol of
–−303.69––
per 1 mol of
–−242.95––
per 1 mol of
–−303.69––
per 1 mol of
–−2429.5––
per 1 mol of
–−2429.5––
per 1 mol of
–−1214.8––

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]
HSCN (ai)76.44[1]92.71[1]144.3[1]-40.2[1]
HSCN (ao)–97.56[1]––
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-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
NaSCN (cr)-170.50[1]–––
NaSCN (ai)-163.68[1]-169.18[1]203.3[1]6.3[1]
(NH4)2S (ai)-231.8[1]-72.6[1]212.1[1]–
H2S (g)-20.63[1]-33.56[1]205.79[1]34.23[1]
H2S (ao)-39.7[1]-27.83[1]121[1]–
C (cr)
graphite
0[1]0[1]5.740[1]8.527[1]
C (cr)
diamond
1.895[1]2.900[1]2.377[1]6.113[1]
C (g)716.682[1]671.257[1]158.096[1]20.838[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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)