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CuS → Cu2+ + S2−

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Electrolytic dissociation of copper(II) sulfide
CuSCopper(II) sulfide
⟶
Cu2+Copper(II) ion + S2−Sulfide ion

Electrolytic dissociation of copper(II) sulfide yields copper(II) ion and sulfide ion. 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

Electrolytic dissociation of copper(II) sulfide
CuSCopper(II) sulfide
⟶
Cu2+Copper(II) ion + S2−Sulfide ion

General equation

Electrolytic dissociation of salt
SaltLewis conjugate
⟶
CationLewis acid + AnionLewis base

Oxidation state of each atom

Electrolytic dissociation of copper(II) sulfide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
CuSCopper(II) sulfide1
Lewis conjugate
Salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
Cu2+Copper(II) ion1
Lewis acid
Cation
S2−Sulfide ion1
Lewis base
Anion

Thermodynamic changes

Changes in standard condition

Electrolytic dissociation of copper(II) sulfide
◆
ΔrG204.9 kJ/mol
K0.13 × 10−35
pK35.90
CuSCrystalline solid
⟶
Cu2+Un-ionized aqueous solution + S2−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
151.0204.9−180.7–
per 1 mol of
151.0204.9−180.7–
per 1 mol of
Copper(II) ion
151.0204.9−180.7–
per 1 mol of
Sulfide ion
151.0204.9−180.7–

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
CuS (cr)-53.1[1]-53.6[1]66.5[1]47.82[1]
* (cr):Crystalline solid

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
Cu2+ (g)3054.07[1]–––
Cu2+ (ao)64.77[1]65.49[1]-99.6[1]–
S2− (ao)33.1[1]85.8[1]-14.6[1]–
* (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)