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2H+ + SO32− → H2SO3

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Reaction of hydrogen ion and sulfurous ion
2H+Hydrogen ion + SO32−Sulfurous ion
⟶
H2SO3Sulfurous acid

The reaction of hydrogen ion and sulfurous ion yields sulfurous acid (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

Reaction of hydrogen ion and sulfurous ion
2H+Hydrogen ion + SO32−Sulfurous ion
⟶
H2SO3Sulfurous acid

General equation

Reaction of cation and anion
CationLewis acid + AnionLewis base
⟶
ProductLewis conjugate + (H2O)
Reaction of hydrogen ion and anion
H+Lewis acid + AnionLewis base
⟶
Acid/Acid salt ionLewis conjugate + (H2O)

Oxidation state of each atom

Reaction of hydrogen ion and sulfurous ion

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H+Hydrogen ion2
Lewis acid
Cation
Hydrogen ion
SO32−Sulfurous ion1
Lewis base
Anion

Products

Chemical formulaNameCoefficientTypeType in general
equation
H2SO3Sulfurous acid1
Lewis conjugate
–
Acid

Thermodynamic changes

Changes in standard condition

Reaction of hydrogen ion and sulfurous ion
◆
ΔrG−51.3 kJ/mol
K9.71 × 108
pK−8.99
2H+Un-ionized aqueous solution + SO32−Un-ionized aqueous solution
⟶
H2SO3Un-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
26.7−51.3261–
per 1 mol of
Hydrogen ion
13.3−25.6131–
per 1 mol of
Sulfurous ion
26.7−51.3261–
per 1 mol of
26.7−51.3261–

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
H+ (g)1536.202[1]–––
H+ (ao)0[1]0[1]0[1]0[1]
SO32− (ao)-635.5[1]-486.5[1]-29[1]–
* (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
H2SO3 (ao)-608.81[1]-537.81[1]232.2[1]–
* (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)