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4H2S + 6KClO → H2SO3 + 3Cl2 + 3K2S + 3H2O

The reaction of hydrogen sulfide and potassium hypochlorite yields sulfurous acid, chlorine, potassium sulfide, 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 oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2SHydrogen sulfide4
Reducing
Reducing
KClOPotassium hypochlorite6
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
H2SO3Sulfurous acid1
Oxidized
Cl2Chlorine3
Reduced
K2SPotassium sulfide3
H2OWater3

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of hydrogen sulfide and potassium hypochlorite
ΔrG−660.0 kJ/mol
K4.24 × 10115
pK−115.63
4H2SUn-ionized aqueous solution + 6KClOIonized aqueous solution
H2SO3Un-ionized aqueous solution + 3Cl2Gas + 3K2SIonized aqueous solution + 3H2OLiquid
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
−565.6−660.0322
per 1 mol of
−141.4−165.080.5
−94.27−110.053.7
per 1 mol of
−565.6−660.0322
per 1 mol of
−188.5−220.0107
per 1 mol of
−188.5−220.0107
per 1 mol of
−188.5−220.0107

Changes in aqueous solution (2)

Reaction of hydrogen sulfide and potassium hypochlorite
ΔrG−639.2 kJ/mol
K9.62 × 10111
pK−111.98
4H2SUn-ionized aqueous solution + 6KClOIonized aqueous solution
H2SO3Un-ionized aqueous solution + 3Cl2Un-ionized aqueous solution + 3K2SIonized aqueous solution + 3H2OLiquid
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
−635.8−639.216
per 1 mol of
−158.9−159.84.0
−106.0−106.52.7
per 1 mol of
−635.8−639.216
per 1 mol of
−211.9−213.15.3
per 1 mol of
−211.9−213.15.3
per 1 mol of
−211.9−213.15.3

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]
KClO (ai)-359.4[1]-320.0[1]146[1]
* (g):Gas, (ao):Un-ionized aqueous solution, (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]
Cl2 (g)0[1]0[1]223.066[1]33.907[1]
Cl2 (ao)-23.4[1]6.94[1]121[1]
K2S (cr)-380.7[1]-364.0[1]105[1]
K2S (ai)-471.5[1]-480.7[1]190.4[1]
K2S (cr)
2 hydrate
-975.3[1]
K2S (cr)
5 hydrate
-1871.5[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]
* (ao):Un-ionized aqueous solution, (g):Gas, (cr):Crystalline solid, (ai):Ionized aqueous solution, (l):Liquid

References

List of references

  1. 1