AlOH2+ + 2[Al(OH)4]− → 3Al(OH)3↓
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- Reaction of aluminium hydroxide ion and tetrahydroxidoaluminate ion
The reaction of aluminium hydroxide ion and tetrahydroxidoaluminate ion yields aluminium hydroxide (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 aluminium hydroxide ion and tetrahydroxidoaluminate 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 tetrahydroxidoaluminate ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| AlOH2+ | Aluminium hydroxide ion | 1 | Lewis acid | Cation |
| [Al(OH)4]− | Tetrahydroxidoaluminate ion | 2 | Lewis base | Anion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Al(OH)3 | Aluminium hydroxide | 3 | Lewis conjugate | – Insoluble in water |
Thermodynamic changes
Changes in standard condition
- Reaction of aluminium hydroxide ion and tetrahydroxidoaluminate ion◆
ΔrG −613 kJ/mol K 2.47 × 10107 pK −107.39 - AlOH2+Un-ionized aqueous solution + 2[Al(OH)4]−Un-ionized aqueous solution3Al(OH)3↓Crystalline solid⟶
| 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 | – | −613 | – | – |
per 1 mol of Aluminium hydroxide ion | – | −613 | – | – |
per 1 mol of Tetrahydroxidoaluminate ion | – | −307 | – | – |
per 1 mol of | – | −204 | – | – |
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] | – | – |
| [Al(OH)4]− (ao) | -1502.5[1] | -1305.3[1] | 102.9[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 |
|---|---|---|---|---|
| Al(OH)3 (cr) | -1284[2] | -1306[2] | 71[2] | 93.1[2] |
| Al(OH)3 (am) | -1276[1] | – | – | – |
* (cr):Crystalline solid, (am):Amorphous solid
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)
- 2James G. Speight (2017)Lange's Handbook of Chemistry, 17th editionMcGraw Hill Education
- ^ ΔfH°, -1284 kJ · mol−1 - p.254
- ^ ΔfG°, -1306 kJ · mol−1 - p.254
- ^ S°, 71 J · K−1 · mol−1 - p.254
- ^ Cp°, 93.1 J · K−1 · mol−1 - p.254