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3H2S + 6NaHCO3 🔥→ 2Na2SO3 + Na2S + 6CO + 6H2O

The reaction of hydrogen sulfide and sodium hydrogencarbonate yields sodium sulfite, sodium sulfide, carbon monoxide, and water (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
H2SHydrogen sulfide3
Reducing
Reducing
NaHCO3Sodium hydrogencarbonate6
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na2SO3Sodium sulfite2
Oxidized
Na2SSodium sulfide1
COCarbon monoxide6
Reduced
H2OWater6

Thermodynamic changes

Changes in standard condition

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG586.1 kJ/mol
K0.21 × 10−102
pK102.68
3H2SGas + 6NaHCO3Crystalline solid
🔥
2Na2SO3Crystalline solid + Na2SCrystalline solid + 6COGas + 6H2OLiquid
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
822.2586.1753.5
per 1 mol of
274.1195.4251.2
137.097.68125.6
per 1 mol of
411.1293.1376.8
per 1 mol of
822.2586.1753.5
per 1 mol of
137.097.68125.6
per 1 mol of
137.097.68125.6

Changes in aqueous solution (1)

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG470.8 kJ/mol
K0.33 × 10−82
pK82.48
3H2SUn-ionized aqueous solution + 6NaHCO3Ionized aqueous solution
🔥
2Na2SO3Ionized aqueous solution + Na2SIonized aqueous solution + 6COGas + 6H2OLiquid
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
654.6470.8620
per 1 mol of
218.2156.9207
109.178.47103
per 1 mol of
327.3235.4310
per 1 mol of
654.6470.8620
per 1 mol of
109.178.47103
per 1 mol of
109.178.47103

Changes in aqueous solution (2)

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG574.4 kJ/mol
K0.23 × 10−100
pK100.63
3H2SUn-ionized aqueous solution + 6NaHCO3Ionized aqueous solution
🔥
2Na2SO3Ionized aqueous solution + Na2SIonized aqueous solution + 6COUn-ionized aqueous solution + 6H2OLiquid
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
592.0574.462
per 1 mol of
197.3191.521
98.6795.7310
per 1 mol of
296.0287.231
per 1 mol of
592.0574.462
per 1 mol of
98.6795.7310
per 1 mol of
98.6795.7310

Changes in aqueous solution (3)

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG477.0 kJ/mol
K0.27 × 10−83
pK83.57
3H2SUn-ionized aqueous solution + 6NaHCO3Un-ionized aqueous solution
🔥
2Na2SO3Ionized aqueous solution + Na2SIonized aqueous solution + 6COGas + 6H2OLiquid
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
725.3477.0839
per 1 mol of
241.8159.0280
120.979.50140
per 1 mol of
362.6238.5420
per 1 mol of
725.3477.0839
per 1 mol of
120.979.50140
per 1 mol of
120.979.50140

Changes in aqueous solution (4)

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG580.6 kJ/mol
K0.19 × 10−101
pK101.72
3H2SUn-ionized aqueous solution + 6NaHCO3Un-ionized aqueous solution
🔥
2Na2SO3Ionized aqueous solution + Na2SIonized aqueous solution + 6COUn-ionized aqueous solution + 6H2OLiquid
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
662.7580.6280
per 1 mol of
220.9193.593.3
110.596.7746.7
per 1 mol of
331.4290.3140
per 1 mol of
662.7580.6280
per 1 mol of
110.596.7746.7
per 1 mol of
110.596.7746.7

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
H2S (g)-20.63[1]-33.56[1]205.79[1]34.23[1]
H2S (ao)-39.7[1]-27.83[1]121[1]
NaHCO3 (cr)-950.81[1]-851.0[1]101.7[1]87.61[1]
NaHCO3 (ai)-932.11[1]-848.66[1]150.2[1]
NaHCO3 (ao)-943.9[1]-849.7[1]113.8[1]
* (g):Gas, (ao):Un-ionized aqueous solution, (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
Na2SO3 (cr)-1100.8[1]-1012.5[1]145.94[1]120.25[1]
Na2SO3 (ai)-1115.87[1]-1010.39[1]87.9[1]
Na2SO3 (cr)
7 hydrate
-3162.3[1]-2676.1[1]444[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]
CO (g)-110.525[1]-137.168[1]197.674[1]29.142[1]
CO (ao)-120.96[1]-119.90[1]104.6[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]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (ao):Un-ionized aqueous solution, (l):Liquid

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)