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Na2CO3 + H2S → NaHCO3 + NaHS

The reaction of sodium carbonate and hydrogen sulfide yields sodium hydrogencarbonate and sodium hydrogensulfide (Other reactions are here). This reaction is an acid-base 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 salt and acid with generating acid salt
SaltBrønsted base + AcidBrønsted acid
Acid saltConjugate acid base

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Na2CO3Sodium carbonate1
Brønsted base
Salt
H2SHydrogen sulfide1
Brønsted acid
Acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaHCO3Sodium hydrogencarbonate1
Conjugate acid base
Acid salt
NaHSSodium hydrogensulfide1
Conjugate acid base
Acid salt

Thermodynamic changes

Changes in standard condition

Reaction of sodium carbonate and hydrogen sulfide
Na2CO3Crystalline solid + H2SGas
NaHCO3Crystalline solid + NaHSCrystalline 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
−36.73
per 1 mol of
−36.73
per 1 mol of
−36.73
−36.73
−36.73

Changes in aqueous solution (1)

Reaction of sodium carbonate and hydrogen sulfide
ΔrG−19.00 kJ/mol
K2.13 × 103
pK−3.33
Na2CO3Ionized aqueous solution + H2SUn-ionized aqueous solution
NaHCO3Ionized aqueous solution + NaHSIonized 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
7.2−19.0090
per 1 mol of
7.2−19.0090
per 1 mol of
7.2−19.0090
7.2−19.0090
7.2−19.0090

Changes in aqueous solution (2)

Reaction of sodium carbonate and hydrogen sulfide
ΔrG−20.0 kJ/mol
K3.19 × 103
pK−3.50
Na2CO3Ionized aqueous solution + H2SUn-ionized aqueous solution
NaHCO3Un-ionized aqueous solution + NaHSIonized 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
−4.5−20.054
per 1 mol of
−4.5−20.054
per 1 mol of
−4.5−20.054
−4.5−20.054
−4.5−20.054

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
Na2CO3 (cr)-1130.68[1]-1044.44[1]134.98[1]112.30[1]
Na2CO3 (ai)-1157.38[1]-1051.64[1]61.1[1]
Na2CO3 (cr)
1 hydrate
-1431.26[1]-1285.31[1]168.11[1]145.60[1]
Na2CO3 (cr)
7 hydrate
-3199.96[1]-2714.2[1]422.2[1]
Na2CO3 (cr)
10 hydrate
-4081.32[1]-3427.66[1]562.7[1]550.32[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]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (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
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]
NaHS (cr)-237.23[1]
NaHS (ai)-257.73[1]-249.81[1]121.8[1]
NaHS (cr)
2 hydrate
-838.47[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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)