ZnI2 + 2KF 💧→ ZnF2↓ + 2KI
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- Reaction of zinc iodide and potassium fluoride
The reaction of zinc iodide and potassium fluoride yields zinc fluoride and potassium iodide. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of zinc iodide and potassium fluoride
General equation
- Precipitation reaction
- Miscible with water/Very soluble in water/Soluble in waterLewis acid + Miscible with water/Very soluble in water/Soluble in waterLewis base💧⟶ Insoluble in water/Very slightly soluble in water/Slightly soluble in waterLewis conjugate + Product(Non-redox product)
Oxidation state of each atom
- Reaction of zinc iodide and potassium fluoride
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| ZnI2 | Zinc iodide | 1 | Lewis acid | Very soluble in water |
| KF | Potassium fluoride | 2 | Lewis base | Very soluble in water |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| ZnF2 | Zinc fluoride | 1 | Lewis conjugate | Slightly soluble in water |
| KI | Potassium iodide | 2 | Non-redox product | – |
Thermodynamic changes
Changes in standard condition
- Reaction of zinc iodide and potassium fluoride◆
ΔrG −78.6 kJ/mol K 5.89 × 1013 pK −13.77
| 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 | −77.6 | −78.6 | −7.9 | – |
per 1 mol of | −77.6 | −78.6 | −7.9 | – |
per 1 mol of | −38.8 | −39.3 | −4.0 | – |
per 1 mol of | −77.6 | −78.6 | −7.9 | – |
per 1 mol of | −38.8 | −39.3 | −4.0 | – |
Changes in aqueous solution (1)
- Reaction of zinc iodide and potassium fluoride◆
ΔrG −8.7 kJ/mol K 3.34 × 101 pK −1.52
| 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 | 54.7 | −8.7 | 213.4 | 232 |
per 1 mol of | 54.7 | −8.7 | 213.4 | 232 |
per 1 mol of | 27.4 | −4.3 | 106.7 | 116 |
per 1 mol of | 54.7 | −8.7 | 213.4 | 232 |
per 1 mol of | 27.4 | −4.3 | 106.7 | 116 |
Changes in aqueous solution (2)
- Reaction of zinc iodide and potassium fluoride◆
ΔrG −18.3 kJ/mol K 1.61 × 103 pK −3.21
| 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 | – | −18.3 | – | – |
per 1 mol of | – | −18.3 | – | – |
per 1 mol of | – | −9.15 | – | – |
per 1 mol of | – | −18.3 | – | – |
per 1 mol of | – | −9.15 | – | – |
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 |
|---|---|---|---|---|
| ZnI2 (cr) | -208.03[1] | -208.95[1] | 161.1[1] | – |
| ZnI2 (ai) | -264.26[1] | -250.20[1] | 110.5[1] | -238[1] |
| ZnI2 (ao) | – | -240.6[1] | – | – |
| KF (cr) | -567.27[1] | -537.75[1] | 66.57[1] | 49.04[1] |
| KF (g) | -325.43[1] | -343.62[1] | 226.41[1] | 35.23[1] |
| KF (ai) | -585.01[1] | -562.06[1] | 88.7[1] | -84.9[1] |
| KF (cr) 2 hydrate | -1163.621[1] | -1021.49[1] | 155.2[1] | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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 |
|---|---|---|---|---|
| ZnF2 (cr) | -764.4[1] | -713.3[1] | 73.68[1] | 65.65[1] |
| ZnF2 (ai) | -819.14[1] | -704.64[1] | -139.7[1] | -167[1] |
| KI (cr) | -327.900[1] | -324.892[1] | 106.32[1] | 52.93[1] |
| KI (g) | -125.5[1] | -166.1[1] | 258.3[1] | 37.11[1] |
| KI (ai) | -307.57[1] | -334.85[1] | 213.8[1] | -120.5[1] |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas
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)
- ^ ΔfH°, -208.03 kJ · mol−1
- ^ ΔfG°, -208.95 kJ · mol−1
- ^ S°, 161.1 J · K−1 · mol−1
- ^ ΔfH°, -264.26 kJ · mol−1
- ^ ΔfG°, -250.20 kJ · mol−1
- ^ S°, 110.5 J · K−1 · mol−1
- ^ Cp°, -238. J · K−1 · mol−1
- ^ ΔfG°, -240.6 kJ · mol−1
- ^ ΔfH°, -567.27 kJ · mol−1
- ^ ΔfG°, -537.75 kJ · mol−1
- ^ S°, 66.57 J · K−1 · mol−1
- ^ Cp°, 49.04 J · K−1 · mol−1
- ^ ΔfH°, -325.43 kJ · mol−1
- ^ ΔfG°, -343.62 kJ · mol−1
- ^ S°, 226.41 J · K−1 · mol−1
- ^ Cp°, 35.23 J · K−1 · mol−1
- ^ ΔfH°, -585.01 kJ · mol−1
- ^ ΔfG°, -562.06 kJ · mol−1
- ^ S°, 88.7 J · K−1 · mol−1
- ^ Cp°, -84.9 J · K−1 · mol−1
- ^ ΔfH°, -1163.621 kJ · mol−1
- ^ ΔfG°, -1021.49 kJ · mol−1
- ^ S°, 155.2 J · K−1 · mol−1
- ^ ΔfH°, -764.4 kJ · mol−1
- ^ ΔfG°, -713.3 kJ · mol−1
- ^ S°, 73.68 J · K−1 · mol−1
- ^ Cp°, 65.65 J · K−1 · mol−1
- ^ ΔfH°, -819.14 kJ · mol−1
- ^ ΔfG°, -704.64 kJ · mol−1
- ^ S°, -139.7 J · K−1 · mol−1
- ^ Cp°, -167. J · K−1 · mol−1
- ^ ΔfH°, -327.900 kJ · mol−1
- ^ ΔfG°, -324.892 kJ · mol−1
- ^ S°, 106.32 J · K−1 · mol−1
- ^ Cp°, 52.93 J · K−1 · mol−1
- ^ ΔfH°, -125.5 kJ · mol−1
- ^ ΔfG°, -166.1 kJ · mol−1
- ^ S°, 258.3 J · K−1 · mol−1
- ^ Cp°, 37.11 J · K−1 · mol−1
- ^ ΔfH°, -307.57 kJ · mol−1
- ^ ΔfG°, -334.85 kJ · mol−1
- ^ S°, 213.8 J · K−1 · mol−1
- ^ Cp°, -120.5 J · K−1 · mol−1