KI + Ca(NO3)2 + 2H+ 🔥→ KIO3 + 2NO↑ + Ca2+ + H2O
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- Reaction of potassium iodide and calcium nitrate under acidic condition
- KIPotassium iodide + Ca(NO3)2Calcium nitrate + 2H+Hydrogen ionKIO3Potassium iodate + 2NO↑Nitrogen monoxide + Ca2+Calcium ion + H2OWater🔥⟶
The reaction of potassium iodide, calcium nitrate, and hydrogen ion yields potassium iodate, nitrogen monoxide, calcium ion, 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 calcium nitrate under acidic condition
- KIPotassium iodide + Ca(NO3)2Calcium nitrate + 2H+Hydrogen ionKIO3Potassium iodate + 2NO↑Nitrogen monoxide + Ca2+Calcium ion + H2OWater🔥⟶
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 calcium nitrate under acidic condition
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KI | Potassium iodide | 1 | Reducing | Oxidizable |
| Ca(NO3)2 | Calcium nitrate | 1 | Oxidizing | Oxidizing under acidic condition |
| H+ | Hydrogen ion | 2 | – | Hydrogen ion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KIO3 | Potassium iodate | 1 | Oxidized | – |
| NO | Nitrogen monoxide | 2 | Reduced | – |
| Ca2+ | Calcium ion | 1 | – | – |
| H2O | Water | 1 | – | Water |
Thermodynamic changes
Changes in standard condition
- Reaction of potassium iodide and calcium nitrate under acidic condition◆
ΔrG 82.1 kJ/mol K 0.41 × 10−14 pK 14.38
| 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 | 143.4 | 82.1 | 205.7 | – |
per 1 mol of | 143.4 | 82.1 | 205.7 | – |
per 1 mol of | 143.4 | 82.1 | 205.7 | – |
per 1 mol of Hydrogen ion | 71.70 | 41.0 | 102.8 | – |
per 1 mol of | 143.4 | 82.1 | 205.7 | – |
per 1 mol of | 71.70 | 41.0 | 102.8 | – |
per 1 mol of Calcium ion | 143.4 | 82.1 | 205.7 | – |
per 1 mol of | 143.4 | 82.1 | 205.7 | – |
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] |
| Ca(NO3)2 (cr) | -938.39[1] | -743.07[1] | 193.3[1] | 149.37[1] |
| Ca(NO3)2 (ai) | -957.55[1] | -776.09[1] | 239.7[1] | – |
| Ca(NO3)2 (cr) 2 hydrate | -1540.76[1] | -1229.11[1] | 269.4[1] | – |
| Ca(NO3)2 (cr) 3 hydrate | -1838.0[1] | -1471.7[1] | 319.2[1] | – |
| Ca(NO3)2 (cr) 4 hydrate | -2132.33[1] | -1713.15[1] | 375.3[1] | – |
| 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 |
|---|---|---|---|---|
| KIO3 (cr) | -501.37[1] | -418.35[1] | 151.46[1] | 106.48[1] |
| KIO3 (ai) | -473.6[1] | -411.2[1] | 220.9[1] | – |
| NO (g) | 90.25[1] | 86.55[1] | 210.761[1] | 29.844[1] |
| Ca2+ (g) | 1925.90[1] | – | – | – |
| Ca2+ (ao) | -542.83[1] | -553.58[1] | -53.1[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] |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (ao):Un-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°, -938.39 kJ · mol−1
- ^ ΔfG°, -743.07 kJ · mol−1
- ^ S°, 193.3 J · K−1 · mol−1
- ^ Cp°, 149.37 J · K−1 · mol−1
- ^ ΔfH°, -957.55 kJ · mol−1
- ^ ΔfG°, -776.09 kJ · mol−1
- ^ S°, 239.7 J · K−1 · mol−1
- ^ ΔfH°, -1540.76 kJ · mol−1
- ^ ΔfG°, -1229.11 kJ · mol−1
- ^ S°, 269.4 J · K−1 · mol−1
- ^ ΔfH°, -1838.0 kJ · mol−1
- ^ ΔfG°, -1471.7 kJ · mol−1
- ^ S°, 319.2 J · K−1 · mol−1
- ^ ΔfH°, -2132.33 kJ · mol−1
- ^ ΔfG°, -1713.15 kJ · mol−1
- ^ S°, 375.3 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°, -501.37 kJ · mol−1
- ^ ΔfG°, -418.35 kJ · mol−1
- ^ S°, 151.46 J · K−1 · mol−1
- ^ Cp°, 106.48 J · K−1 · mol−1
- ^ ΔfH°, -473.6 kJ · mol−1
- ^ ΔfG°, -411.2 kJ · mol−1
- ^ S°, 220.9 J · K−1 · mol−1
- ^ ΔfH°, 90.25 kJ · mol−1
- ^ ΔfG°, 86.55 kJ · mol−1
- ^ S°, 210.761 J · K−1 · mol−1
- ^ Cp°, 29.844 J · K−1 · mol−1
- ^ ΔfH°, 1925.90 kJ · mol−1
- ^ ΔfH°, -542.83 kJ · mol−1
- ^ ΔfG°, -553.58 kJ · mol−1
- ^ S°, -53.1 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