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2HCl + 2e− → H2 + 2Cl−

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Reduction of hydrogen chloride
2HClHydrogen chloride + 2e−Electron
⟶
H2Hydrogen + 2Cl−Chloride ion

Reduction of hydrogen chloride yields hydrogen and chloride ion (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

Reduction of hydrogen chloride
2HClHydrogen chloride + 2e−Electron
⟶
H2Hydrogen + 2Cl−Chloride ion

General equation

Reduction of reducible species
ReactantOxidizing agent + e−
⟶
ProductReduction product

Oxidation state of each atom

Reduction of hydrogen chloride

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
HClHydrogen chloride2
Oxidizing
–
e−Electron2
–
Electron

Products

Chemical formulaNameCoefficientTypeType in general
equation
H2Hydrogen1
Reduced
–
Cl−Chloride ion2
–
–

Thermodynamic changes

Changes in standard condition (1)

Reduction of hydrogen chloride
◆
ΔrG0.000 kJ/mol
K1.00 × 100
pK0.00
2HClIonized aqueous solution + 2e−
⟶
H2Gas + 2Cl−Un-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
0.0000.000130.728.8
per 1 mol of
0.0000.00065.3514.4
per 1 mol of
Electron
0.0000.00065.3514.4
per 1 mol of
0.0000.000130.728.8
per 1 mol of
Chloride ion
0.0000.00065.3514.4

Changes in standard condition (2)

Reduction of hydrogen chloride
◆
ΔrG17.6 kJ/mol
K0.83 × 10−3
pK3.08
2HClIonized aqueous solution + 2e−
⟶
H2Un-ionized aqueous solution + 2Cl−Un-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
−4.217.6577–
per 1 mol of
−2.18.80289–
per 1 mol of
Electron
−2.18.80289–
per 1 mol of
−4.217.6577–
per 1 mol of
Chloride ion
−2.18.80289–

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
HCl (g)-92.307[1]-95.299[1]186.908[1]29.12[1]
HCl (ai)-167.159[1]-131.228[1]56.5[1]-136.4[1]
e−––––
* (g):Gas, (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
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]–
Cl− (g)-233.13[1]–––
Cl− (ao)-167.159[1]-131.228[1]56.5[1]-136.4[1]
* (g):Gas, (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)