PbS → Pb2+ + S2−
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- Electrolytic dissociation of lead(II) sulfide
Electrolytic dissociation of lead(II) sulfide yields lead(II) ion and sulfide ion. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Electrolytic dissociation of lead(II) sulfide
General equation
- Electrolytic dissociation of salt
- SaltLewis conjugate ⟶ CationLewis acid + AnionLewis base
Oxidation state of each atom
- Electrolytic dissociation of lead(II) sulfide
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| PbS | Lead(II) sulfide | 1 | Lewis conjugate | Salt |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Pb2+ | Lead(II) ion | 1 | Lewis acid | Cation |
| S2− | Sulfide ion | 1 | Lewis base | Anion |
Thermodynamic changes
Changes in standard condition
- Electrolytic dissociation of lead(II) sulfide◆
ΔrG 160.1 kJ/mol K 0.89 × 10−28 pK 28.05
| 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 | 131.8 | 160.1 | −95.3 | – |
per 1 mol of | 131.8 | 160.1 | −95.3 | – |
per 1 mol of Lead(II) ion | 131.8 | 160.1 | −95.3 | – |
per 1 mol of Sulfide ion | 131.8 | 160.1 | −95.3 | – |
Thermodynamic data of reactants
| Chemical formula | Standard 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 |
|---|---|---|---|---|
| PbS (cr) | -100.4[1] | -98.7[1] | 91.2[1] | 49.50[1] |
* (cr):Crystalline solid
Thermodynamic data of products
| Chemical formula | Standard 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 |
|---|---|---|---|---|
| Pb2+ (g) | 2373.33[1] | – | – | – |
| Pb2+ (ao) | -1.7[1] | -24.43[1] | 10.5[1] | – |
| S2− (ao) | 33.1[1] | 85.8[1] | -14.6[1] | – |
* (g):Gas, (ao):Un-ionized aqueous solution
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)