AlOH2+ + HPO42− → AlPO4↓ + H2O
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- Reaction of aluminium hydroxide ion and hydrogenphosphate ion
The reaction of aluminium hydroxide ion and hydrogenphosphate ion yields aluminium phosphate and water. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of aluminium hydroxide ion and hydrogenphosphate 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 aluminium hydroxide ion and hydrogenphosphate ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| AlOH2+ | Aluminium hydroxide ion | 1 | Lewis acid | Cation |
| HPO42− | Hydrogenphosphate ion | 1 | Lewis base | Anion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| AlPO4 | Aluminium phosphate | 1 | Lewis conjugate | – Insoluble in water |
| H2O | Water | 1 | – | Water |
Thermodynamic changes
Changes in standard condition
- Reaction of aluminium hydroxide ion and hydrogenphosphate ion◆
ΔrG −71.8 kJ/mol K 3.79 × 1012 pK −12.58
| 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 | – | −71.8 | – | – |
per 1 mol of Aluminium hydroxide ion | – | −71.8 | – | – |
per 1 mol of Hydrogenphosphate ion | – | −71.8 | – | – |
per 1 mol of | – | −71.8 | – | – |
per 1 mol of | – | −71.8 | – | – |
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 |
|---|---|---|---|---|
| AlOH2+ (ao) | – | -694.1[1] | – | – |
| HPO42− (ao) | -1292.14[1] | -1089.15[1] | -33.5[1] | – |
* (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 |
|---|---|---|---|---|
| AlPO4 (cr) | -1733.8[1] | -1617.9[1] | 90.79[1] | 93.18[1] |
| H2O (cr) | – | – | – | – |
| H2O (l) | -285.830[1] | -237.129[1] | 69.91[1] | 75.291[1] |
| H2O (g) | -241.818[1] | -228.572[1] | 188.825[1] | 33.577[1] |
* (cr):Crystalline solid, (l):Liquid, (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)
- ^ ΔfG°, -694.1 kJ · mol−1
- ^ ΔfH°, -1292.14 kJ · mol−1
- ^ ΔfG°, -1089.15 kJ · mol−1
- ^ S°, -33.5 J · K−1 · mol−1
- ^ ΔfH°, -1733.8 kJ · mol−1
- ^ ΔfG°, -1617.9 kJ · mol−1
- ^ S°, 90.79 J · K−1 · mol−1
- ^ Cp°, 93.18 J · K−1 · mol−1
- ^ ΔfH°, -285.830 kJ · mol−1
- ^ ΔfG°, -237.129 kJ · mol−1
- ^ S°, 69.91 J · K−1 · mol−1
- ^ Cp°, 75.291 J · K−1 · mol−1
- ^ ΔfH°, -241.818 kJ · mol−1
- ^ ΔfG°, -228.572 kJ · mol−1
- ^ S°, 188.825 J · K−1 · mol−1
- ^ Cp°, 33.577 J · K−1 · mol−1