8KI + 5Ag2SO4 🔥→ 4K2SO4 + 4I2 + Ag2S + 4Ag2O
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- Reaction of potassium iodide and silver(I) sulfate
The reaction of potassium iodide and silver(I) sulfate yields potassium sulfate, , silver(I) sulfide, and silver(I) oxide (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 silver(I) sulfate
General equation
- Reaction of oxidizable species and reducible species
- Oxidizable speciesReducing agent + Reducible speciesOxidizing agent🔥⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of potassium iodide and silver(I) sulfate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| KI | Potassium iodide | 8 | Reducing | Oxidizable |
| Ag2SO4 | Silver(I) sulfate | 5 | Oxidizing | Reducible |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| K2SO4 | Potassium sulfate | 4 | – | – |
| 4 | Oxidized | – | ||
| Ag2S | Silver(I) sulfide | 1 | Reduced | – |
| Ag2O | Silver(I) oxide | 4 | – | – |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of potassium iodide and silver(I) sulfate◆
ΔrG 320.24 kJ/mol K 0.79 × 10−56 pK 56.10
| 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 | 294.65 | 320.24 | −56.6 | 3.22 |
per 1 mol of | 36.831 | 40.030 | −7.08 | 0.403 |
per 1 mol of | 58.930 | 64.048 | −11.3 | 0.644 |
per 1 mol of | 73.662 | 80.060 | −14.2 | 0.805 |
| 73.662 | 80.060 | −14.2 | 0.805 | |
per 1 mol of | 294.65 | 320.24 | −56.6 | 3.22 |
per 1 mol of | 73.662 | 80.060 | −14.2 | 0.805 |
Changes in standard condition (2)
- Reaction of potassium iodide and silver(I) sulfate◆
ΔrG 321.45 kJ/mol K 0.48 × 10−56 pK 56.32
| 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 | 297.83 | 321.45 | −50.0 | – |
per 1 mol of | 37.229 | 40.181 | −6.25 | – |
per 1 mol of | 59.566 | 64.290 | −10.0 | – |
per 1 mol of | 74.457 | 80.362 | −12.5 | – |
| 74.457 | 80.362 | −12.5 | – | |
per 1 mol of | 297.83 | 321.45 | −50.0 | – |
per 1 mol of | 74.457 | 80.362 | −12.5 | – |
Changes in aqueous solution
- Reaction of potassium iodide and silver(I) sulfate◆
ΔrG 366.15 kJ/mol K 0.71 × 10−64 pK 64.15
| 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 | 228.6 | 366.15 | −460.5 | – |
per 1 mol of | 28.57 | 45.769 | −57.56 | – |
per 1 mol of | 45.72 | 73.230 | −92.10 | – |
per 1 mol of | 57.15 | 91.537 | −115.1 | – |
| 57.15 | 91.537 | −115.1 | – | |
per 1 mol of | 228.6 | 366.15 | −460.5 | – |
per 1 mol of | 57.15 | 91.537 | −115.1 | – |
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] |
| Ag2SO4 (cr) | -715.88[1] | -618.41[1] | 200.4[1] | 131.38[1] |
| Ag2SO4 (ai) | -698.10[1] | -590.30[1] | 165.7[1] | -251[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 |
|---|---|---|---|---|
| K2SO4 (cr) | -1437.79[1] | -1321.37[1] | 175.56[1] | 131.46[1] |
| K2SO4 (g) | -1096[1] | -1033[1] | 364[1] | 108.8[1] |
| K2SO4 (ai) | -1414.02[1] | -1311.07[1] | 225.1[1] | -251[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] | – |
| Ag2S (cr) α, orthorhombic | -32.59[1] | -40.67[1] | 144.01[1] | 76.53[1] |
| Ag2S (cr) β | -29.41[1] | -39.46[1] | 150.6[1] | – |
| Ag2O (cr) | -31.05[1] | -11.20[1] | 121.3[1] | 65.86[1] |
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution
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°, -715.88 kJ · mol−1
- ^ ΔfG°, -618.41 kJ · mol−1
- ^ S°, 200.4 J · K−1 · mol−1
- ^ Cp°, 131.38 J · K−1 · mol−1
- ^ ΔfH°, -698.10 kJ · mol−1
- ^ ΔfG°, -590.30 kJ · mol−1
- ^ S°, 165.7 J · K−1 · mol−1
- ^ Cp°, -251. J · K−1 · mol−1
- ^ ΔfH°, -1437.79 kJ · mol−1
- ^ ΔfG°, -1321.37 kJ · mol−1
- ^ S°, 175.56 J · K−1 · mol−1
- ^ Cp°, 131.46 J · K−1 · mol−1
- ^ ΔfH°, -1096. kJ · mol−1
- ^ ΔfG°, -1033. kJ · mol−1
- ^ S°, 364. J · K−1 · mol−1
- ^ Cp°, 108.8 J · K−1 · mol−1
- ^ ΔfH°, -1414.02 kJ · mol−1
- ^ ΔfG°, -1311.07 kJ · mol−1
- ^ S°, 225.1 J · K−1 · mol−1
- ^ Cp°, -251. J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 116.135 J · K−1 · mol−1
- ^ Cp°, 54.438 J · K−1 · mol−1
- ^ ΔfH°, 62.438 kJ · mol−1
- ^ ΔfG°, 19.327 kJ · mol−1
- ^ S°, 260.69 J · K−1 · mol−1
- ^ Cp°, 36.90 J · K−1 · mol−1
- ^ ΔfH°, 22.6 kJ · mol−1
- ^ ΔfG°, 16.40 kJ · mol−1
- ^ S°, 137.2 J · K−1 · mol−1
- ^ ΔfH°, -32.59 kJ · mol−1
- ^ ΔfG°, -40.67 kJ · mol−1
- ^ S°, 144.01 J · K−1 · mol−1
- ^ Cp°, 76.53 J · K−1 · mol−1
- ^ ΔfH°, -29.41 kJ · mol−1
- ^ ΔfG°, -39.46 kJ · mol−1
- ^ S°, 150.6 J · K−1 · mol−1
- ^ ΔfH°, -31.05 kJ · mol−1
- ^ ΔfG°, -11.20 kJ · mol−1
- ^ S°, 121.3 J · K−1 · mol−1
- ^ Cp°, 65.86 J · K−1 · mol−1