Fe2(OH)24+ + 2HAsO42− → 2FeAsO4↓ + 2H2O
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- Reaction of diiron(III) dihydroxide ion and hydrogenarsenate ion
- Fe2(OH)24+Diiron(III) dihydroxide ion + 2HAsO42−Hydrogenarsenate ion2FeAsO4↓Iron(III) arsenate + 2H2OWater⟶
The reaction of diiron(III) dihydroxide ion and hydrogenarsenate ion yields iron(III) arsenate and water. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of diiron(III) dihydroxide ion and hydrogenarsenate ion
- Fe2(OH)24+Diiron(III) dihydroxide ion + 2HAsO42−Hydrogenarsenate ion2FeAsO4↓Iron(III) arsenate + 2H2OWater⟶
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 diiron(III) dihydroxide ion and hydrogenarsenate ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Fe2(OH)24+ | Diiron(III) dihydroxide ion | 1 | Lewis acid | Cation |
| HAsO42− | Hydrogenarsenate ion | 2 | Lewis base | Anion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| FeAsO4 | Iron(III) arsenate | 2 | Lewis conjugate | – Very slightly soluble in water |
| H2O | Water | 2 | – | 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 |
|---|---|---|---|---|
| Fe2(OH)24+ (ao) | -612.1[1] | -467.27[1] | -356[1] | – |
| HAsO42− (ao) | -906.34[1] | -714.60[1] | -1.7[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 |
|---|---|---|---|---|
| FeAsO4 | – | – | – | – |
| 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)
- ^ ΔfH°, -612.1 kJ · mol−1
- ^ ΔfG°, -467.27 kJ · mol−1
- ^ S°, -356. J · K−1 · mol−1
- ^ ΔfH°, -906.34 kJ · mol−1
- ^ ΔfG°, -714.60 kJ · mol−1
- ^ S°, -1.7 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