You-iggy

7H2S + 6NaHCO3 🔥→ 4H2SO3 + 3Na2S + 6H2O + 6C

The reaction of hydrogen sulfide and sodium hydrogencarbonate yields sulfurous acid, sodium sulfide, water, 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

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 sulfide7
Reducing
Reducing
NaHCO3Sodium hydrogencarbonate6
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
H2SO3Sulfurous acid4
Oxidized
Na2SSodium sulfide3
H2OWater6
CCarbon6
Reduced

Thermodynamic changes

Changes in standard condition (1)

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG398.5 kJ/mol
K0.15 × 10−69
pK69.81
7H2SUn-ionized aqueous solution + 6NaHCO3Ionized aqueous solution
🔥
4H2SO3Un-ionized aqueous solution + 3Na2SIonized aqueous solution + 6H2OLiquid + 6CCrystalline 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
378.4398.5−56
per 1 mol of
54.0656.93−8.0
63.0766.42−9.3
per 1 mol of
94.6099.63−14
per 1 mol of
126.1132.8−19
per 1 mol of
63.0766.42−9.3
per 1 mol of
63.0766.42−9.3

Changes in standard condition (2)

Reaction of hydrogen sulfide and sodium hydrogencarbonate
ΔrG404.7 kJ/mol
K0.13 × 10−70
pK70.90
7H2SUn-ionized aqueous solution + 6NaHCO3Un-ionized aqueous solution
🔥
4H2SO3Un-ionized aqueous solution + 3Na2SIonized aqueous solution + 6H2OLiquid + 6CCrystalline 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
449.2404.7163
per 1 mol of
64.1757.8123.3
74.8767.4527.2
per 1 mol of
112.3101.240.8
per 1 mol of
149.7134.954.3
per 1 mol of
74.8767.4527.2
per 1 mol of
74.8767.4527.2

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
H2SO3 (ao)-608.81[1]-537.81[1]232.2[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]
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]
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]
* (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (ai):Ionized aqueous solution, (l):Liquid, (g):Gas

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)