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Cd(OH)2 + SO3 → CdSO4 + H2O

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Reaction of cadmium hydroxide and sulfur trioxide
Cd(OH)2Cadmium hydroxide + SO3Sulfur trioxide
⟶
CdSO4Cadmium sulfate + H2OWater

The reaction of cadmium hydroxide and sulfur trioxide yields cadmium sulfate 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

Reaction of cadmium hydroxide and sulfur trioxide
Cd(OH)2Cadmium hydroxide + SO3Sulfur trioxide
⟶
CdSO4Cadmium sulfate + H2OWater

General equation

Reaction of base and acidic oxide
BaseLewis base + Acidic oxideLewis acid + H2O
⟶
Oxoacid saltLewis conjugate + (H2O)
Reaction of hydroxide base and acidic oxide
Hydroxide baseLewis base + Acidic oxideLewis acid
⟶
Oxoacid saltLewis conjugate + H2O
Reaction of weak hydroxide base and strongly acidic oxide
Weak hydroxide baseLewis base + Strongly acidic oxideLewis acid
⟶
Salt of strong acid and weak baseLewis conjugate + H2O

Oxidation state of each atom

Reaction of cadmium hydroxide and sulfur trioxide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Cd(OH)2Cadmium hydroxide1
Lewis base
Base
Hydroxide base
Weak hydroxide base
SO3Sulfur trioxide1
Lewis acid
Acidic oxide
Strongly acidic oxide

Products

Chemical formulaNameCoefficientTypeType in general
equation
CdSO4Cadmium sulfate1
Lewis conjugate
Oxoacid salt
Salt of strong acid and weak base
H2OWater1
–
Water

Thermodynamic changes

Changes in standard condition

Reaction of cadmium hydroxide and sulfur trioxide
◆
ΔrG−212.5 kJ/mol
K1.69 × 1037
pK−37.23
Cd(OH)2Crystalline solidprecipitated + SO3Liquid
⟶
CdSO4Crystalline 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
−217.4−212.5−17–
per 1 mol of
−217.4−212.5−17–
per 1 mol of
−217.4−212.5−17–
per 1 mol of
−217.4−212.5−17–
per 1 mol of
−217.4−212.5−17–

Changes in aqueous solution (1)

Reaction of cadmium hydroxide and sulfur trioxide
◆
ΔrG−243.0 kJ/mol
K3.73 × 1042
pK−42.57
Cd(OH)2Un-ionized aqueous solution + SO3Crystalline solidβ
⟶
CdSO4Crystalline 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
–−243.0––
per 1 mol of
–−243.0––
per 1 mol of
–−243.0––
per 1 mol of
–−243.0––
per 1 mol of
–−243.0––

Changes in aqueous solution (2)

Reaction of cadmium hydroxide and sulfur trioxide
◆
ΔrG−212.0 kJ/mol
K1.38 × 1037
pK−37.14
Cd(OH)2Crystalline solidprecipitated + SO3Crystalline solidβ
⟶
CdSO4Crystalline 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
−203.9−212.026–
per 1 mol of
−203.9−212.026–
per 1 mol of
−203.9−212.026–
per 1 mol of
−203.9−212.026–
per 1 mol of
−203.9−212.026–

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]––
SO3 (cr)
β
-454.51[1]-374.21[1]70.7[1]–
SO3 (l)-441.04[1]-373.75[1]113.8[1]–
SO3 (g)-395.72[1]-371.06[1]256.76[1]50.67[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (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
CdSO4 (cr)-933.28[1]-822.72[1]123.039[1]99.58[1]
CdSO4 (ai)-985.16[1]-822.13[1]-53.1[1]–
CdSO4 (cr)
1 hydrate
-1239.55[1]-1068.73[1]154.030[1]134.56[1]
CdSO4 (cr)
8/3 hydrate
-1729.4[1]-1465.141[1]229.630[1]213.26[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, (ai):Ionized aqueous solution, (l):Liquid, (g):Gas

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)