Ca2+ + 2F− → CaF2↓
Last updated:
- Reaction of calcium ion and fluoride ion
The reaction of calcium ion and fluoride ion yields calcium fluoride (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 calcium ion and fluoride 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 calcium ion and fluoride ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Ca2+ | Calcium ion | 1 | Lewis acid | Cation |
| F− | Fluoride ion | 2 | Lewis base | Anion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaF2 | Calcium fluoride | 1 | Lewis conjugate | – Insoluble in water |
Thermodynamic changes
Changes in standard condition
- Reaction of calcium ion and fluoride ion◆
ΔrG −56.1 kJ/mol K 6.73 × 109 pK −9.83
| 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 | −11.5 | −56.1 | 149.6 | – |
per 1 mol of Calcium ion | −11.5 | −56.1 | 149.6 | – |
per 1 mol of Fluoride ion | −5.75 | −28.1 | 74.80 | – |
per 1 mol of | −11.5 | −56.1 | 149.6 | – |
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 |
|---|---|---|---|---|
| Ca2+ (g) | 1925.90[1] | – | – | – |
| Ca2+ (ao) | -542.83[1] | -553.58[1] | -53.1[1] | – |
| F− (g) | -255.39[1] | – | – | – |
| F− (ao) | -332.63[1] | -278.79[1] | -13.8[1] | -106.7[1] |
* (g):Gas, (ao):Un-ionized aqueous solution
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 |
|---|---|---|---|---|
| CaF2 (cr) | -1219.6[1] | -1167.3[1] | 68.87[1] | 67.03[1] |
| CaF2 (g) | -781.6[1] | -790.4[1] | 274.37[1] | 51.25[1] |
| CaF2 (ai) | -1208.09[1] | -1111.15[1] | -80.8[1] | – |
* (cr):Crystalline solid, (g):Gas, (ai):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)
- ^ ΔfH°, 1925.90 kJ · mol−1
- ^ ΔfH°, -542.83 kJ · mol−1
- ^ ΔfG°, -553.58 kJ · mol−1
- ^ S°, -53.1 J · K−1 · mol−1
- ^ ΔfH°, -255.39 kJ · mol−1
- ^ ΔfH°, -332.63 kJ · mol−1
- ^ ΔfG°, -278.79 kJ · mol−1
- ^ S°, -13.8 J · K−1 · mol−1
- ^ Cp°, -106.7 J · K−1 · mol−1
- ^ ΔfH°, -1219.6 kJ · mol−1
- ^ ΔfG°, -1167.3 kJ · mol−1
- ^ S°, 68.87 J · K−1 · mol−1
- ^ Cp°, 67.03 J · K−1 · mol−1
- ^ ΔfH°, -781.6 kJ · mol−1
- ^ ΔfG°, -790.4 kJ · mol−1
- ^ S°, 274.37 J · K−1 · mol−1
- ^ Cp°, 51.25 J · K−1 · mol−1
- ^ ΔfH°, -1208.09 kJ · mol−1
- ^ ΔfG°, -1111.15 kJ · mol−1
- ^ S°, -80.8 J · K−1 · mol−1