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H2 + Co(OH)2 → Co + 2H2O

The reaction of hydrogen and cobalt(II) hydroxide yields cobalt and water. 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 categories

Reaction data

Chemical equation

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2Hydrogen1
Reducing
Reducing
Co(OH)2Cobalt(II) hydroxide1
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
CoCobalt1
Reduced
H2OWater2
Oxidized

Thermodynamic changes

Changes in standard condition (1)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−24.2 kJ/mol
K1.74 × 104
pK−4.24
H2Gas + Co(OH)2Crystalline solidblue, precipitated
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−24.2
per 1 mol of
−24.2
−24.2
per 1 mol of
−24.2
per 1 mol of
−12.1

Changes in standard condition (2)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−23.9 kJ/mol
K1.54 × 104
pK−4.19
H2Gas + Co(OH)2Crystalline solidblue, precipitated
CoCrystalline solidβ, face centered cubic + 2H2OLiquid
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
−23.9
per 1 mol of
−23.9
−23.9
per 1 mol of
−23.9
per 1 mol of
−11.9

Changes in standard condition (3)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−20.0 kJ/mol
K3.19 × 103
pK−3.50
H2Gas + Co(OH)2Crystalline solidpink, precipitated
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−32.0−20.0−40
per 1 mol of
−32.0−20.0−40
−32.0−20.0−40
per 1 mol of
−32.0−20.0−40
per 1 mol of
−16.0−10.0−20

Changes in standard condition (4)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−19.7 kJ/mol
K2.83 × 103
pK−3.45
H2Gas + Co(OH)2Crystalline solidpink, precipitated
CoCrystalline solidβ, face centered cubic + 2H2OLiquid
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
−31.5−19.7−39
per 1 mol of
−31.5−19.7−39
−31.5−19.7−39
per 1 mol of
−31.5−19.7−39
per 1 mol of
−15.8−9.85−20

Changes in standard condition (5)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−16.2 kJ/mol
K6.89 × 102
pK−2.84
H2Gas + Co(OH)2Crystalline solidpink, precipitated, aged
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−16.2
per 1 mol of
−16.2
−16.2
per 1 mol of
−16.2
per 1 mol of
−8.10

Changes in standard condition (6)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−15.9 kJ/mol
K6.10 × 102
pK−2.79
H2Gas + Co(OH)2Crystalline solidpink, precipitated, aged
CoCrystalline solidβ, face centered cubic + 2H2OLiquid
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
−15.9
per 1 mol of
−15.9
−15.9
per 1 mol of
−15.9
per 1 mol of
−7.95

Changes in aqueous solution (1)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−70.2 kJ/mol
K1.99 × 1012
pK−12.30
H2Un-ionized aqueous solution + Co(OH)2Un-ionized aqueous solution
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−70.2
per 1 mol of
−70.2
−70.2
per 1 mol of
−70.2
per 1 mol of
−35.1

Changes in aqueous solution (2)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−41.8 kJ/mol
K2.10 × 107
pK−7.32
H2Un-ionized aqueous solution + Co(OH)2Crystalline solidblue, precipitated
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−41.8
per 1 mol of
−41.8
−41.8
per 1 mol of
−41.8
per 1 mol of
−20.9

Changes in aqueous solution (3)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−37.6 kJ/mol
K3.87 × 106
pK−6.59
H2Un-ionized aqueous solution + Co(OH)2Crystalline solidpink, precipitated
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−27.8−37.6−486
per 1 mol of
−27.8−37.6−486
−27.8−37.6−486
per 1 mol of
−27.8−37.6−486
per 1 mol of
−13.9−18.8−243

Changes in aqueous solution (4)

Reaction of hydrogen and cobalt(II) hydroxide
ΔrG−33.8 kJ/mol
K8.35 × 105
pK−5.92
H2Un-ionized aqueous solution + Co(OH)2Crystalline solidpink, precipitated, aged
CoCrystalline solidα, hexagonal + 2H2OLiquid
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
−33.8
per 1 mol of
−33.8
−33.8
per 1 mol of
−33.8
per 1 mol of
−16.9

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
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]
Co(OH)2 (cr)
blue, precipitated
-450.1[1]
Co(OH)2 (cr)
pink, precipitated
-539.7[1]-454.3[1]79[1]
Co(OH)2 (cr)
pink, precipitated, aged
-458.1[1]
Co(OH)2 (ai)-518.0[1]-369.0[1]-134[1]
Co(OH)2 (ao)-421.7[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
Co (cr)
α, hexagonal
0[1]0[1]30.04[1]24.81[1]
Co (cr)
β, face centered cubic
0.46[1]0.25[1]30.71[1]
Co (g)424.7[1]380.3[1]179.515[1]23.020[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]
* (cr):Crystalline solid, (g):Gas, (l):Liquid

References

List of references

  1. 1