20KI + 6FeAsO4 + 20H+ → 20K+ + 2HIO3 + 3As2O3 + 6FeI3 + 9H2O
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- Reaction of potassium iodide and iron(III) arsenate under acidic condition
- 20KIPotassium iodide + 6FeAsO4Iron(III) arsenate + 20H+Hydrogen ion20K+Potassium ion + 2HIO3Iodic acid + 3As2O3Diarsenic trioxide + 6FeI3Iron(III) iodide + 9H2OWater⟶
The reaction of potassium iodide, iron(III) arsenate, and hydrogen ion yields potassium ion, iodic acid, diarsenic trioxide, iron(III) iodide, and water (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of potassium iodide and iron(III) arsenate under acidic condition
- 20KIPotassium iodide + 6FeAsO4Iron(III) arsenate + 20H+Hydrogen ion20K+Potassium ion + 2HIO3Iodic acid + 3As2O3Diarsenic trioxide + 6FeI3Iron(III) iodide + 9H2OWater⟶
General equation
- Reaction of oxidizable species and oxidizing species under acidic condition
- Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent + H+Non-redox agent ⟶ ProductOxidation product + ProductReduction product + H2ONon-redox product
Oxidation state of each atom
- Reaction of potassium iodide and iron(III) arsenate under acidic condition
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KI | Potassium iodide | 20 | Reducing | Oxidizable |
| FeAsO4 | Iron(III) arsenate | 6 | Oxidizing | Oxidizing under acidic condition |
| H+ | Hydrogen ion | 20 | – | Hydrogen ion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| K+ | Potassium ion | 20 | – | – |
| HIO3 | Iodic acid | 2 | Oxidized | – |
| As2O3 | Diarsenic trioxide | 3 | Reduced | – |
| FeI3 | Iron(III) iodide | 6 | – | – |
| H2O | Water | 9 | – | 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 |
|---|---|---|---|---|
| KI (cr) | -327.900[1] | -324.892[1] | 106.32[1] | 52.93[1] |
| KI (g) | -125.5[1] | -166.1[1] | 258.3[1] | 37.11[1] |
| KI (ai) | -307.57[1] | -334.85[1] | 213.8[1] | -120.5[1] |
| FeAsO4 | – | – | – | – |
| H+ (g) | 1536.202[1] | – | – | – |
| H+ (ao) | 0[1] | 0[1] | 0[1] | 0[1] |
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (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 |
|---|---|---|---|---|
| K+ (g) | 514.26[1] | – | – | – |
| K+ (ao) | -252.38[1] | -283.27[1] | 102.5[1] | 21.8[1] |
| HIO3 (cr) | -230.1[1] | – | – | – |
| HIO3 (ao) | -211.3[1] | -132.6[1] | 166.9[1] | – |
| As2O3 (cr) octahedral | -656.97[1] | -576.22[1] | 107.1[1] | 95.65[1] |
| As2O3 (cr) monoclinic | -654.8[1] | -576.97[1] | 117[1] | – |
| As2O3 (g) | -604.6[1] | -548.9[1] | 191[1] | – |
| As2O3 (aq) | -626.8[1] | – | – | – |
| FeI3 (g) | 71[1] | – | – | – |
| FeI3 (ai) | -214.2[1] | -159.4[1] | 18.0[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] |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (aq):Aqueous solution, (ai):Ionized aqueous solution, (l):Liquid
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°, -327.900 kJ · mol−1
- ^ ΔfG°, -324.892 kJ · mol−1
- ^ S°, 106.32 J · K−1 · mol−1
- ^ Cp°, 52.93 J · K−1 · mol−1
- ^ ΔfH°, -125.5 kJ · mol−1
- ^ ΔfG°, -166.1 kJ · mol−1
- ^ S°, 258.3 J · K−1 · mol−1
- ^ Cp°, 37.11 J · K−1 · mol−1
- ^ ΔfH°, -307.57 kJ · mol−1
- ^ ΔfG°, -334.85 kJ · mol−1
- ^ S°, 213.8 J · K−1 · mol−1
- ^ Cp°, -120.5 J · K−1 · mol−1
- ^ ΔfH°, 1536.202 kJ · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 0 J · K−1 · mol−1
- ^ Cp°, 0 J · K−1 · mol−1
- ^ ΔfH°, 514.26 kJ · mol−1
- ^ ΔfH°, -252.38 kJ · mol−1
- ^ ΔfG°, -283.27 kJ · mol−1
- ^ S°, 102.5 J · K−1 · mol−1
- ^ Cp°, 21.8 J · K−1 · mol−1
- ^ ΔfH°, -230.1 kJ · mol−1
- ^ ΔfH°, -211.3 kJ · mol−1
- ^ ΔfG°, -132.6 kJ · mol−1
- ^ S°, 166.9 J · K−1 · mol−1
- ^ ΔfH°, -656.97 kJ · mol−1
- ^ ΔfG°, -576.22 kJ · mol−1
- ^ S°, 107.1 J · K−1 · mol−1
- ^ Cp°, 95.65 J · K−1 · mol−1
- ^ ΔfH°, -654.8 kJ · mol−1
- ^ ΔfG°, -576.97 kJ · mol−1
- ^ S°, 117 J · K−1 · mol−1
- ^ ΔfH°, -604.6 kJ · mol−1
- ^ ΔfG°, -548.9 kJ · mol−1
- ^ S°, 191 J · K−1 · mol−1
- ^ ΔfH°, -626.8 kJ · mol−1
- ^ ΔfH°, 71. kJ · mol−1
- ^ ΔfH°, -214.2 kJ · mol−1
- ^ ΔfG°, -159.4 kJ · mol−1
- ^ S°, 18.0 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