2Au(OH)2+ + [Au(OH)5]2− → 3Au(OH)3↓
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- Reaction of gold(III) dihydroxide ion and pentahydroxidoaurate(III) ion
- 2Au(OH)2+Gold(III) dihydroxide ion + [Au(OH)5]2−Pentahydroxidoaurate(III) ion3Au(OH)3↓Gold(III) hydroxide⟶
The reaction of gold(III) dihydroxide ion and pentahydroxidoaurate(III) ion yields gold(III) 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 gold(III) dihydroxide ion and pentahydroxidoaurate(III) ion
- 2Au(OH)2+Gold(III) dihydroxide ion + [Au(OH)5]2−Pentahydroxidoaurate(III) ion3Au(OH)3↓Gold(III) hydroxide⟶
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 gold(III) dihydroxide ion and pentahydroxidoaurate(III) ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Au(OH)2+ | Gold(III) dihydroxide ion | 2 | Lewis acid | Cation |
| [Au(OH)5]2− | Pentahydroxidoaurate(III) ion | 1 | Lewis base | Anion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Au(OH)3 | Gold(III) hydroxide | 3 | Lewis conjugate | – Insoluble in water |
Thermodynamic changes
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 |
|---|---|---|---|---|
| Au(OH)2+ | – | – | – | – |
| [Au(OH)5]2− | – | – | – | – |
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 |
|---|---|---|---|---|
| Au(OH)3 (cr) precipitated | -424.7[1] | -316.92[1] | 189.5[1] | – |
| Au(OH)3 (ao) | – | -283.37[1] | – | – |
* (cr):Crystalline solid, (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)