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2H2S + 2KClO4 → K2SO3 + H2SO3 + 2HClO

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Reaction of hydrogen sulfide and potassium perchlorate
2H2SHydrogen sulfide + 2KClO4Potassium perchlorate
⟶
K2SO3Potassium sulfite + H2SO3Sulfurous acid + 2HClOHypochlorous acid

The reaction of hydrogen sulfide and potassium perchlorate yields potassium sulfite, sulfurous acid, and hypochlorous acid (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 hydrogen sulfide and potassium perchlorate
2H2SHydrogen sulfide + 2KClO4Potassium perchlorate
⟶
K2SO3Potassium sulfite + H2SO3Sulfurous acid + 2HClOHypochlorous acid

General equation

Reaction of reducing species and oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of hydrogen sulfide and potassium perchlorate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2SHydrogen sulfide2
Reducing
Reducing
KClO4Potassium perchlorate2
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
K2SO3Potassium sulfite1
Oxidized
–
H2SO3Sulfurous acid1
Oxidized
–
HClOHypochlorous acid2
Reduced
–

Thermodynamic changes

Changes in standard condition

Reaction of hydrogen sulfide and potassium perchlorate
◆
ΔrG−1111.5 kJ/mol
K5.33 × 10194
pK−194.73
2H2SUn-ionized aqueous solution + 2KClO4Ionized aqueous solution
⟶
K2SO3Ionized aqueous solution + H2SO3Un-ionized aqueous solution + 2HClOUn-ionized 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
−1147.9−1111.5−119–
per 1 mol of
−573.95−555.75−59.5–
−573.95−555.75−59.5–
per 1 mol of
−1147.9−1111.5−119–
per 1 mol of
−1147.9−1111.5−119–
per 1 mol of
−573.95−555.75−59.5–

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]–
KClO4 (cr)-432.75[1]-303.09[1]151.0[1]112.38[1]
KClO4 (ai)-381.71[1]-291.79[1]284.5[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
K2SO3 (cr)-1125.5[1]–––
K2SO3 (ai)-1140.1[1]-1053.1[1]176[1]–
H2SO3 (ao)-608.81[1]-537.81[1]232.2[1]–
HClO (g)-78.7[1]-66.1[1]236.67[1]37.15[1]
HClO (ao)-120.9[1]-79.9[1]142[1]–
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (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)