6KI + Zn(NO3)2 + 4H+ ๐ฅโ 2KNO2 + 4K+ + 2I2 + ZnI2 + 2H2O
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- Reaction of potassium iodide and zinc nitrate under acidic condition
- 6KIPotassium iodide + Zn(NO3)2Zinc nitrate + 4H+Hydrogen ion2KNO2Potassium nitrite + 4K+Potassium ion + 2 + ZnI2Zinc iodide + 2H2OWater๐ฅโถ
The reaction of potassium iodide, zinc nitrate, and hydrogen ion yields potassium nitrite, potassium ion, , zinc 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 zinc nitrate under acidic condition
- 6KIPotassium iodide + Zn(NO3)2Zinc nitrate + 4H+Hydrogen ion2KNO2Potassium nitrite + 4K+Potassium ion + 2 + ZnI2Zinc iodide + 2H2OWater๐ฅโถ
General equation
- Reaction of oxidizable species and oxidizing species under acidic condition
- Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent + H+Non-redox agent โถ ProductOxidation product + ProductReduction product + H2ONon-redox product
Oxidation state of each atom
- Reaction of potassium iodide and zinc nitrate under acidic condition
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KI | Potassium iodide | 6 | Reducing | Oxidizable |
| Zn(NO3)2 | Zinc nitrate | 1 | Oxidizing | Oxidizing under acidic condition |
| H+ | Hydrogen ion | 4 | โ | Hydrogen ion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KNO2 | Potassium nitrite | 2 | Reduced | โ |
| K+ | Potassium ion | 4 | โ | โ |
| 2 | Oxidized | โ | ||
| ZnI2 | Zinc iodide | 1 | โ | โ |
| H2O | Water | 2 | โ | Water |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of potassium iodide and zinc nitrate under acidic conditionโ
ฮrG โ76.9 kJ/mol K 2.97 ร 1013 pK โ13.47
| Standard enthalpy of reaction ฮrHยฐ kJ ยท molโ1 | Standard Gibbs energy of reaction ฮrGยฐ kJ ยท molโ1 | Standard entropy of reaction ฮrSยฐ J ยท Kโ1 ยท molโ1 | Standard heat capacity of reaction at constant pressure ฮrCpยฐ J ยท Kโ1 ยท molโ1 | |
|---|---|---|---|---|
per 1 mol of Equation | โ100.0 | โ76.9 | โ77.8 | โ |
per 1 mol of | โ16.67 | โ12.8 | โ13.0 | โ |
per 1 mol of | โ100.0 | โ76.9 | โ77.8 | โ |
per 1 mol of Hydrogen ion | โ25.00 | โ19.2 | โ19.4 | โ |
per 1 mol of | โ50.00 | โ38.5 | โ38.9 | โ |
per 1 mol of Potassium ion | โ25.00 | โ19.2 | โ19.4 | โ |
| โ50.00 | โ38.5 | โ38.9 | โ | |
per 1 mol of | โ100.0 | โ76.9 | โ77.8 | โ |
per 1 mol of | โ50.00 | โ38.5 | โ38.9 | โ |
Changes in standard condition (2)
- Reaction of potassium iodide and zinc nitrate under acidic conditionโ
ฮrG โ67.3 kJ/mol K 6.17 ร 1011 pK โ11.79
| Standard enthalpy of reaction ฮrHยฐ kJ ยท molโ1 | Standard Gibbs energy of reaction ฮrGยฐ kJ ยท molโ1 | Standard entropy of reaction ฮrSยฐ J ยท Kโ1 ยท molโ1 | Standard heat capacity of reaction at constant pressure ฮrCpยฐ J ยท Kโ1 ยท molโ1 | |
|---|---|---|---|---|
per 1 mol of Equation | โ | โ67.3 | โ | โ |
per 1 mol of | โ | โ11.2 | โ | โ |
per 1 mol of | โ | โ67.3 | โ | โ |
per 1 mol of Hydrogen ion | โ | โ16.8 | โ | โ |
per 1 mol of | โ | โ33.6 | โ | โ |
per 1 mol of Potassium ion | โ | โ16.8 | โ | โ |
| โ | โ33.6 | โ | โ | |
per 1 mol of | โ | โ67.3 | โ | โ |
per 1 mol of | โ | โ33.6 | โ | โ |
Thermodynamic data of reactants
| Chemical formula | Standard enthalpy of formation ฮfHยฐ kJ ยท molโ1 | Standard Gibbs energy of formation ฮfGยฐ kJ ยท molโ1 | Standard molar entropy Sยฐ J ยท Kโ1 ยท molโ1 | Standard molar heat capacity at constant pressure Cpยฐ J ยท Kโ1 ยท molโ1 |
|---|---|---|---|---|
| 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] |
| Zn(NO3)2 (cr) | -483.7[1] | โ | โ | โ |
| Zn(NO3)2 (ai) | -568.61[1] | -369.57[1] | 180.7[1] | -126[1] |
| Zn(NO3)2 (cr) 1 hydrate | -805.0[1] | โ | โ | โ |
| Zn(NO3)2 (cr) 2 hydrate | -1110.27[1] | โ | โ | โ |
| Zn(NO3)2 (cr) 4 hydrate | -1699.12[1] | โ | โ | โ |
| Zn(NO3)2 (cr) 6 hydrate | -2306.64[1] | -1772.71[1] | 456.9[1] | 323.0[1] |
| H+ (g) | 1536.202[1] | โ | โ | โ |
| 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 ฮfHยฐ kJ ยท molโ1 | Standard Gibbs energy of formation ฮfGยฐ kJ ยท molโ1 | Standard molar entropy Sยฐ J ยท Kโ1 ยท molโ1 | Standard molar heat capacity at constant pressure Cpยฐ J ยท Kโ1 ยท molโ1 |
|---|---|---|---|---|
| KNO2 (cr) rhombic | -369.82[1] | -306.55[1] | 152.09[1] | 107.40[1] |
| KNO2 (ai) | -356.9[1] | -315.4[1] | 225.5[1] | โ |
| K+ (g) | 514.26[1] | โ | โ | โ |
| K+ (ao) | -252.38[1] | -283.27[1] | 102.5[1] | 21.8[1] |
| (cr) | 0[1] | 0[1] | 116.135[1] | 54.438[1] |
| (g) | 62.438[1] | 19.327[1] | 260.69[1] | 36.90[1] |
| (ao) | 22.6[1] | 16.40[1] | 137.2[1] | โ |
| ZnI2 (cr) | -208.03[1] | -208.95[1] | 161.1[1] | โ |
| ZnI2 (ai) | -264.26[1] | -250.20[1] | 110.5[1] | -238[1] |
| ZnI2 (ao) | โ | -240.6[1] | โ | โ |
| H2O (cr) | โ | โ | โ | โ |
| 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)
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- ^ ฮfGยฐ, -324.892 kJ ยท molโ1
- ^ Sยฐ, 106.32 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 52.93 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -125.5 kJ ยท molโ1
- ^ ฮfGยฐ, -166.1 kJ ยท molโ1
- ^ Sยฐ, 258.3 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 37.11 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -307.57 kJ ยท molโ1
- ^ ฮfGยฐ, -334.85 kJ ยท molโ1
- ^ Sยฐ, 213.8 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, -120.5 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -483.7 kJ ยท molโ1
- ^ ฮfHยฐ, -568.61 kJ ยท molโ1
- ^ ฮfGยฐ, -369.57 kJ ยท molโ1
- ^ Sยฐ, 180.7 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, -126. J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -805.0 kJ ยท molโ1
- ^ ฮfHยฐ, -1110.27 kJ ยท molโ1
- ^ ฮfHยฐ, -1699.12 kJ ยท molโ1
- ^ ฮfHยฐ, -2306.64 kJ ยท molโ1
- ^ ฮfGยฐ, -1772.71 kJ ยท molโ1
- ^ Sยฐ, 456.9 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 323.0 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 1536.202 kJ ยท molโ1
- ^ ฮfHยฐ, 0 kJ ยท molโ1
- ^ ฮfGยฐ, 0 kJ ยท molโ1
- ^ Sยฐ, 0 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 0 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -369.82 kJ ยท molโ1
- ^ ฮfGยฐ, -306.55 kJ ยท molโ1
- ^ Sยฐ, 152.09 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 107.40 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -356.9 kJ ยท molโ1
- ^ ฮfGยฐ, -315.4 kJ ยท molโ1
- ^ Sยฐ, 225.5 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 514.26 kJ ยท molโ1
- ^ ฮfHยฐ, -252.38 kJ ยท molโ1
- ^ ฮfGยฐ, -283.27 kJ ยท molโ1
- ^ Sยฐ, 102.5 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 21.8 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 0 kJ ยท molโ1
- ^ ฮfGยฐ, 0 kJ ยท molโ1
- ^ Sยฐ, 116.135 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 54.438 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 62.438 kJ ยท molโ1
- ^ ฮfGยฐ, 19.327 kJ ยท molโ1
- ^ Sยฐ, 260.69 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 36.90 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 22.6 kJ ยท molโ1
- ^ ฮfGยฐ, 16.40 kJ ยท molโ1
- ^ Sยฐ, 137.2 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -208.03 kJ ยท molโ1
- ^ ฮfGยฐ, -208.95 kJ ยท molโ1
- ^ Sยฐ, 161.1 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -264.26 kJ ยท molโ1
- ^ ฮfGยฐ, -250.20 kJ ยท molโ1
- ^ Sยฐ, 110.5 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, -238. J ยท Kโ1 ยท molโ1
- ^ ฮfGยฐ, -240.6 kJ ยท molโ1
- ^ ฮfHยฐ, -285.830 kJ ยท molโ1
- ^ ฮfGยฐ, -237.129 kJ ยท molโ1
- ^ Sยฐ, 69.91 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 75.291 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -241.818 kJ ยท molโ1
- ^ ฮfGยฐ, -228.572 kJ ยท molโ1
- ^ Sยฐ, 188.825 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 33.577 J ยท Kโ1 ยท molโ1