PbI+ + I− → PbI2↓
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- Reaction of lead(II) iodide ion and iodide ion
The reaction of lead(II) iodide ion and iodide ion yields lead(II) iodide (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of lead(II) iodide ion and iodide ion
General equation
- Reaction of cation and anion
- CationLewis acid + AnionLewis base ⟶ ProductLewis conjugate + (H2O)
- Precipitation reaction of cation and anion
- CationLewis acid + AnionLewis base ⟶ Insoluble in water/Very slightly soluble in water/Slightly soluble in waterLewis conjugate + (H2O)
Oxidation state of each atom
- Reaction of lead(II) iodide ion and iodide ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| PbI+ | Lead(II) iodide ion | 1 | Lewis acid | Cation |
| I− | Iodide ion | 1 | Lewis base | Anion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| PbI2 | Lead(II) iodide | 1 | Lewis conjugate | – Very slightly soluble in water |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of lead(II) iodide ion and iodide ion◆
ΔrG 11.0 kJ/mol K 0.12 × 10−1 pK 1.93
| 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 | – | 11.0 | – | – |
per 1 mol of Lead(II) iodide ion | – | 11.0 | – | – |
per 1 mol of Iodide ion | – | 11.0 | – | – |
per 1 mol of | – | 11.0 | – | – |
Changes in standard condition (2)
- Reaction of lead(II) iodide ion and iodide ion◆
ΔrG −4.9 kJ/mol K 7.22 × 100 pK −0.86
| 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 | – | −4.9 | – | – |
per 1 mol of Lead(II) iodide ion | – | −4.9 | – | – |
per 1 mol of Iodide ion | – | −4.9 | – | – |
per 1 mol of | – | −4.9 | – | – |
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 |
|---|---|---|---|---|
| PbI+ (ao) | – | -87.0[1] | – | – |
| I− (g) | -194.6[1] | – | – | – |
| I− (ao) | -55.19[1] | -51.57[1] | 111.3[1] | -142.3[1] |
* (ao):Un-ionized aqueous solution, (g):Gas
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 |
|---|---|---|---|---|
| PbI2 (cr) | -175.48[1] | -173.64[1] | 174.85[1] | 77.36[1] |
| PbI2 (ai) | -112.1[1] | -127.57[1] | 233.0[1] | – |
| PbI2 (ao) | – | -143.5[1] | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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)
- ^ ΔfG°, -87.0 kJ · mol−1
- ^ ΔfH°, -194.6 kJ · mol−1
- ^ ΔfH°, -55.19 kJ · mol−1
- ^ ΔfG°, -51.57 kJ · mol−1
- ^ S°, 111.3 J · K−1 · mol−1
- ^ Cp°, -142.3 J · K−1 · mol−1
- ^ ΔfH°, -175.48 kJ · mol−1
- ^ ΔfG°, -173.64 kJ · mol−1
- ^ S°, 174.85 J · K−1 · mol−1
- ^ Cp°, 77.36 J · K−1 · mol−1
- ^ ΔfH°, -112.1 kJ · mol−1
- ^ ΔfG°, -127.57 kJ · mol−1
- ^ S°, 233.0 J · K−1 · mol−1
- ^ ΔfG°, -143.5 kJ · mol−1