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Cd(OH)2 + CO2 → CdCO3 + H2O

The reaction of cadmium hydroxide and carbon dioxide yields cadmium carbonate and water. 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 categories

Reaction data

Chemical equation

General equation

Reaction of base and acidic oxide
BaseLewis base + Acidic oxideLewis acid + H2O
Oxoacid saltLewis conjugate + (H2O)

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Cd(OH)2Cadmium hydroxide1
Lewis base
Base
Hydroxide base
Weak hydroxide base
CO2Carbon dioxide1
Lewis acid
Acidic oxide
Weakly acidic oxide

Products

Chemical formulaNameCoefficientTypeType in general
equation
CdCO3Cadmium carbonate1
Lewis conjugate
Oxoacid salt
Salt of weak acid and weak base
H2OWater1
Water

Thermodynamic changes

Changes in standard condition

Reaction of cadmium hydroxide and carbon dioxide
ΔrG−38.6 kJ/mol
K5.79 × 106
pK−6.76
Cd(OH)2Crystalline solidprecipitated + CO2Gas
CdCO3Crystalline solid + H2OLiquid
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
−82.2−38.6−147
per 1 mol of
−82.2−38.6−147
per 1 mol of
−82.2−38.6−147
per 1 mol of
−82.2−38.6−147
per 1 mol of
−82.2−38.6−147

Changes in aqueous solution (1)

Reaction of cadmium hydroxide and carbon dioxide
ΔrG−77.9 kJ/mol
K4.44 × 1013
pK−13.65
Cd(OH)2Un-ionized aqueous solution + CO2Un-ionized aqueous solution
CdCO3Crystalline solid + H2OLiquid
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
−77.9
per 1 mol of
−77.9
per 1 mol of
−77.9
per 1 mol of
−77.9
per 1 mol of
−77.9

Changes in aqueous solution (2)

Reaction of cadmium hydroxide and carbon dioxide
ΔrG−46.9 kJ/mol
K1.65 × 108
pK−8.22
Cd(OH)2Crystalline solidprecipitated + CO2Un-ionized aqueous solution
CdCO3Crystalline solid + H2OLiquid
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
−61.9−46.9−51
per 1 mol of
−61.9−46.9−51
per 1 mol of
−61.9−46.9−51
per 1 mol of
−61.9−46.9−51
per 1 mol of
−61.9−46.9−51

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
Cd(OH)2 (cr)
precipitated
-560.7[1]-473.6[1]96[1]
Cd(OH)2 (ai)-535.89[1]-392.10[1]-94.6[1]
Cd(OH)2 (ao)-442.6[1]
CO2 (g)-393.509[1]-394.359[1]213.74[1]37.11[1]
CO2 (ao)-413.80[1]-385.98[1]117.6[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (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
CdCO3 (cr)-750.6[1]-669.4[1]92.5[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, (l):Liquid, (g):Gas

References

List of references

  1. 1