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Fe(OH)2+ + H2O → Fe(OH)3 + H+

Reaction of iron(III) dihydroxide ion and water
Fe(OH)2+Iron(III) dihydroxide ion + H2OWater
Fe(OH)3Iron(III) hydroxide + H+Hydrogen ion

The reaction of iron(III) dihydroxide ion and water yields iron(III) hydroxide and hydrogen ion (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 iron(III) dihydroxide ion and water
Fe(OH)2+Iron(III) dihydroxide ion + H2OWater
Fe(OH)3Iron(III) hydroxide + H+Hydrogen ion

General equation

Reaction of ion and water with generating hydrogen ion
Cation/AnionBrønsted acid + H2OBrønsted base
Proton accepting ion/BaseConjugate base + H+Conjugate acid

Oxidation state of each atom

Reaction of iron(III) dihydroxide ion and water

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Fe(OH)2+Iron(III) dihydroxide ion1
Brønsted acid
Cation
H2OWater1
Brønsted base
Water

Products

Chemical formulaNameCoefficientTypeType in general
equation
Fe(OH)3Iron(III) hydroxide1
Conjugate base
Base
H+Hydrogen ion1
Conjugate acid
Hydrogen ion

Thermodynamic changes

Changes in standard condition

Reaction of iron(III) dihydroxide ion and water
ΔrG15.8 kJ/mol
K0.17 × 10−2
pK2.77
Fe(OH)2+Un-ionized aqueous solution + H2OLiquid
Fe(OH)3Un-ionized aqueous solution + H+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
15.8
per 1 mol of
Iron(III) dihydroxide ion
15.8
per 1 mol of
15.8
15.8
per 1 mol of
Hydrogen ion
15.8

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
Fe(OH)2+ (ao)-438.0[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, (cr):Crystalline solid, (l):Liquid, (g):Gas

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
Fe(OH)3 (cr)
precipitated
-823.0[1]-696.5[1]106.7[1]
Fe(OH)3 (ao)-659.3[1]
H+ (g)1536.202[1]
H+ (ao)0[1]0[1]0[1]0[1]
* (cr):Crystalline solid, (ao):Un-ionized aqueous solution, (g):Gas

References

List of references

  1. 1