KI + 2HBrO3 → KBrO3 + HIO3 + HBr↑
Last updated:
- Reaction of potassium iodide and bromic acid
The reaction of potassium iodide and bromic acid yields potassium bromate, iodic acid, and hydrogen bromide (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 bromic acid
General equation
- Reaction of oxidizable species and oxidizing species
- Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of potassium iodide and bromic acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KI | Potassium iodide | 1 | Reducing | Oxidizable |
| HBrO3 | Bromic acid | 2 | Oxidizing | Oxidizing |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KBrO3 | Potassium bromate | 1 | – | – |
| HIO3 | Iodic acid | 1 | Oxidized | – |
| HBr | Hydrogen bromide | 1 | Reduced | – |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of potassium iodide and bromic acid◆
ΔrG −153.1 kJ/mol K 6.64 × 1026 pK −26.82
| 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 | −125.4 | −153.1 | 92.6 | – |
per 1 mol of | −125.4 | −153.1 | 92.6 | – |
per 1 mol of | −62.70 | −76.55 | 46.3 | – |
per 1 mol of | −125.4 | −153.1 | 92.6 | – |
per 1 mol of | −125.4 | −153.1 | 92.6 | – |
per 1 mol of | −125.4 | −153.1 | 92.6 | – |
Changes in standard condition (2)
- Reaction of potassium iodide and bromic acid◆
ΔrG −203.6 kJ/mol K 4.67 × 1035 pK −35.67
| 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 | −210.6 | −203.6 | −23.7 | – |
per 1 mol of | −210.6 | −203.6 | −23.7 | – |
per 1 mol of | −105.3 | −101.8 | −11.8 | – |
per 1 mol of | −210.6 | −203.6 | −23.7 | – |
per 1 mol of | −210.6 | −203.6 | −23.7 | – |
per 1 mol of | −210.6 | −203.6 | −23.7 | – |
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] |
| HBrO3 (ai) | -67.07[1] | 18.60[1] | 161.71[1] | – |
* (cr):Crystalline solid, (g):Gas, (ai):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 |
|---|---|---|---|---|
| KBrO3 (cr) | -360.24[1] | -271.16[1] | 149.16[1] | 105.19[1] |
| KBrO3 (ai) | -319.45[1] | -264.67[1] | 264.22[1] | – |
| HIO3 (cr) | -230.1[1] | – | – | – |
| HIO3 (ao) | -211.3[1] | -132.6[1] | 166.9[1] | – |
| HBr (g) | -36.40[1] | -53.45[1] | 198.695[1] | 29.142[1] |
| HBr (ai) | -121.55[1] | -103.96[1] | 82.4[1] | -141.8[1] |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (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°, -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°, -67.07 kJ · mol−1
- ^ ΔfG°, 18.60 kJ · mol−1
- ^ S°, 161.71 J · K−1 · mol−1
- ^ ΔfH°, -360.24 kJ · mol−1
- ^ ΔfG°, -271.16 kJ · mol−1
- ^ S°, 149.16 J · K−1 · mol−1
- ^ Cp°, 105.19 J · K−1 · mol−1
- ^ ΔfH°, -319.45 kJ · mol−1
- ^ ΔfG°, -264.67 kJ · mol−1
- ^ S°, 264.22 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°, -36.40 kJ · mol−1
- ^ ΔfG°, -53.45 kJ · mol−1
- ^ S°, 198.695 J · K−1 · mol−1
- ^ Cp°, 29.142 J · K−1 · mol−1
- ^ ΔfH°, -121.55 kJ · mol−1
- ^ ΔfG°, -103.96 kJ · mol−1
- ^ S°, 82.4 J · K−1 · mol−1
- ^ Cp°, -141.8 J · K−1 · mol−1