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2Cd(OH)2 ๐Ÿ”ฅโ†’ 2CdO + O2โ†‘ + 2H2โ†‘

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Decomposition of cadmium hydroxide
2Cd(OH)2Cadmium hydroxide
๐Ÿ”ฅ
โŸถ
2CdOCadmium oxide + O2โ†‘Oxygen + 2H2โ†‘Hydrogen

Decomposition of cadmium hydroxide yields cadmium oxide, oxygen, and hydrogen (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

Decomposition of cadmium hydroxide
2Cd(OH)2Cadmium hydroxide
๐Ÿ”ฅ
โŸถ
2CdOCadmium oxide + O2โ†‘Oxygen + 2H2โ†‘Hydrogen

General equation

Thermal decomposition with redox
Thermally decomposable substanceSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Decomposition of cadmium hydroxide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Cd(OH)2Cadmium hydroxide2
Self redox agent
Thermally decomposable

Products

Chemical formulaNameCoefficientTypeType in general
equation
CdOCadmium oxide2
โ€“
โ€“
O2Oxygen1
Oxidized
โ€“
H2Hydrogen2
Reduced
โ€“

Thermodynamic changes

Changes in standard condition

Decomposition of cadmium hydroxide
โ—†
ฮ”rG490.4 kJ/mol
K0.12 ร— 10โˆ’85
pK85.91
2Cd(OH)2Crystalline solidprecipitated
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Gas + 2H2โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
605.0490.4384โ€“
per 1 mol of
302.5245.2192โ€“
per 1 mol of
302.5245.2192โ€“
per 1 mol of
605.0490.4384โ€“
per 1 mol of
302.5245.2192โ€“

Changes in aqueous solution (1)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG428.4 kJ/mol
K0.89 ร— 10โˆ’75
pK75.05
2Cd(OH)2Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Gas + 2H2โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“428.4โ€“โ€“
per 1 mol of
โ€“214.2โ€“โ€“
per 1 mol of
โ€“214.2โ€“โ€“
per 1 mol of
โ€“428.4โ€“โ€“
per 1 mol of
โ€“214.2โ€“โ€“

Changes in aqueous solution (2)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG463.6 kJ/mol
K0.60 ร— 10โˆ’81
pK81.22
2Cd(OH)2Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Gas + 2H2โ†‘Un-ionized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“463.6โ€“โ€“
per 1 mol of
โ€“231.8โ€“โ€“
per 1 mol of
โ€“231.8โ€“โ€“
per 1 mol of
โ€“463.6โ€“โ€“
per 1 mol of
โ€“231.8โ€“โ€“

Changes in aqueous solution (3)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG444.8 kJ/mol
K0.12 ร— 10โˆ’77
pK77.93
2Cd(OH)2Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Un-ionized aqueous solution + 2H2โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“444.8โ€“โ€“
per 1 mol of
โ€“222.4โ€“โ€“
per 1 mol of
โ€“222.4โ€“โ€“
per 1 mol of
โ€“444.8โ€“โ€“
per 1 mol of
โ€“222.4โ€“โ€“

Changes in aqueous solution (4)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG480.0 kJ/mol
K0.81 ร— 10โˆ’84
pK84.09
2Cd(OH)2Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Un-ionized aqueous solution + 2H2โ†‘Un-ionized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“480.0โ€“โ€“
per 1 mol of
โ€“240.0โ€“โ€“
per 1 mol of
โ€“240.0โ€“โ€“
per 1 mol of
โ€“480.0โ€“โ€“
per 1 mol of
โ€“240.0โ€“โ€“

Changes in aqueous solution (5)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG490.4 kJ/mol
K0.12 ร— 10โˆ’85
pK85.91
2Cd(OH)2Crystalline solidprecipitated
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Gas + 2H2โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
605.0490.4384โ€“
per 1 mol of
302.5245.2192โ€“
per 1 mol of
302.5245.2192โ€“
per 1 mol of
605.0490.4384โ€“
per 1 mol of
302.5245.2192โ€“

Changes in aqueous solution (6)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG525.6 kJ/mol
K0.83 ร— 10โˆ’92
pK92.08
2Cd(OH)2Crystalline solidprecipitated
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Gas + 2H2โ†‘Un-ionized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
596.6525.61277โ€“
per 1 mol of
298.3262.8638.5โ€“
per 1 mol of
298.3262.8638.5โ€“
per 1 mol of
596.6525.61277โ€“
per 1 mol of
298.3262.8638.5โ€“

Changes in aqueous solution (7)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG506.8 kJ/mol
K0.16 ร— 10โˆ’88
pK88.79
2Cd(OH)2Crystalline solidprecipitated
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Un-ionized aqueous solution + 2H2โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
593.3506.8290โ€“
per 1 mol of
296.6253.4145โ€“
per 1 mol of
296.6253.4145โ€“
per 1 mol of
593.3506.8290โ€“
per 1 mol of
296.6253.4145โ€“

Changes in aqueous solution (8)

Decomposition of cadmium hydroxide
โ—†
ฮ”rG542.0 kJ/mol
K0.11 ร— 10โˆ’94
pK94.95
2Cd(OH)2Crystalline solidprecipitated
๐Ÿ”ฅ
โŸถ
2CdOCrystalline solid + O2โ†‘Un-ionized aqueous solution + 2H2โ†‘Un-ionized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
584.9542.01183โ€“
per 1 mol of
292.4271.0591.5โ€“
per 1 mol of
292.4271.0591.5โ€“
per 1 mol of
584.9542.01183โ€“
per 1 mol of
292.4271.0591.5โ€“

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
Cd(OH)2 (cr)
precipitated
-560.7[1]-473.6[1]96[1]โ€“
Cd(OH)2 (ai)-535.89[1]-392.10[1]-94.6[1]โ€“
Cd(OH)2 (ao)โ€“-442.6[1]โ€“โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
CdO (cr)-258.2[1]-228.4[1]54.8[1]43.43[1]
O2 (g)0[1]0[1]205.138[1]29.355[1]
O2 (ao)-11.7[1]16.4[1]110.9[1]โ€“
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]โ€“
* (cr):Crystalline solid, (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)