2Ca(HSO4)2 + K2S2O3 💧→ 2CaSO4↓ + 2KHSO4 + H2S2O3
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The reaction of calcium hydrogensulfate and potassium thiosulfate yields calcium sulfate, potassium hydrogensulfate, and thiosulfuric acid (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of calcium hydrogensulfate and potassium thiosulfate
General equation
- Precipitation reaction
- Miscible with water/Very soluble in water/Soluble in waterLewis acid + Miscible with water/Very soluble in water/Soluble in waterLewis base💧⟶ Insoluble in water/Very slightly soluble in water/Slightly soluble in waterLewis conjugate + Product(Non-redox product)
Oxidation state of each atom
- Reaction of calcium hydrogensulfate and potassium thiosulfate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Ca(HSO4)2 | Calcium hydrogensulfate | 2 | Lewis acid | Soluble in water |
| K2S2O3 | Potassium thiosulfate | 1 | Lewis base | Very soluble in water |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaSO4 | Calcium sulfate | 2 | Lewis conjugate | Slightly soluble in water |
| KHSO4 | Potassium hydrogensulfate | 2 | Non-redox product | – |
| H2S2O3 | Thiosulfuric acid | 1 | Non-redox product | – |
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 |
|---|---|---|---|---|
| Ca(HSO4)2 | – | – | – | – |
| K2S2O3 (cr) | -1173.6[1] | – | – | – |
| K2S2O3 (ai) | -1156.9[1] | -1089.0[1] | 272[1] | – |
| K2S2O3 (cr) 1 hydrate | -1464.8[1] | – | – | – |
* (cr):Crystalline solid, (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 |
|---|---|---|---|---|
| CaSO4 (cr) insoluble, anhydrite | -1434.11[1] | -1321.79[1] | 106.7[1] | 99.66[1] |
| CaSO4 (cr) soluble, α | -1425.24[1] | -1313.42[1] | 108.4[1] | 100.21[1] |
| CaSO4 (cr) soluble, β | -1420.80[1] | -1308.98[1] | 108.4[1] | 99.04[1] |
| CaSO4 (ai) | -1452.10[1] | -1298.10[1] | -33.1[1] | – |
| CaSO4 (cr) 0.5 hydrate macrocrystalline, α | -1576.74[1] | -1436.74[1] | 130.5[1] | 119.41[1] |
| CaSO4 (cr) 0.5 hydrate microcrystalline, β | -1574.65[1] | -1435.78[1] | 134.3[1] | 124.22[1] |
| CaSO4 (cr) 2 hydrate selenite | -2022.63[1] | -1797.28[1] | 194.1[1] | 186.02[1] |
| KHSO4 (cr) | -1160.6[1] | -1031.3[1] | 138.1[1] | – |
| KHSO4 (ai) | -1139.72[1] | -1039.18[1] | 234.3[1] | -63[1] |
| H2S2O3 | – | – | – | – |
* (cr):Crystalline solid, (ai):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°, -1173.6 kJ · mol−1
- ^ ΔfH°, -1156.9 kJ · mol−1
- ^ ΔfG°, -1089.0 kJ · mol−1
- ^ S°, 272. J · K−1 · mol−1
- ^ ΔfH°, -1464.8 kJ · mol−1
- ^ ΔfH°, -1434.11 kJ · mol−1
- ^ ΔfG°, -1321.79 kJ · mol−1
- ^ S°, 106.7 J · K−1 · mol−1
- ^ Cp°, 99.66 J · K−1 · mol−1
- ^ ΔfH°, -1425.24 kJ · mol−1
- ^ ΔfG°, -1313.42 kJ · mol−1
- ^ S°, 108.4 J · K−1 · mol−1
- ^ Cp°, 100.21 J · K−1 · mol−1
- ^ ΔfH°, -1420.80 kJ · mol−1
- ^ ΔfG°, -1308.98 kJ · mol−1
- ^ S°, 108.4 J · K−1 · mol−1
- ^ Cp°, 99.04 J · K−1 · mol−1
- ^ ΔfH°, -1452.10 kJ · mol−1
- ^ ΔfG°, -1298.10 kJ · mol−1
- ^ S°, -33.1 J · K−1 · mol−1
- ^ ΔfH°, -1576.74 kJ · mol−1
- ^ ΔfG°, -1436.74 kJ · mol−1
- ^ S°, 130.5 J · K−1 · mol−1
- ^ Cp°, 119.41 J · K−1 · mol−1
- ^ ΔfH°, -1574.65 kJ · mol−1
- ^ ΔfG°, -1435.78 kJ · mol−1
- ^ S°, 134.3 J · K−1 · mol−1
- ^ Cp°, 124.22 J · K−1 · mol−1
- ^ ΔfH°, -2022.63 kJ · mol−1
- ^ ΔfG°, -1797.28 kJ · mol−1
- ^ S°, 194.1 J · K−1 · mol−1
- ^ Cp°, 186.02 J · K−1 · mol−1
- ^ ΔfH°, -1160.6 kJ · mol−1
- ^ ΔfG°, -1031.3 kJ · mol−1
- ^ S°, 138.1 J · K−1 · mol−1
- ^ ΔfH°, -1139.72 kJ · mol−1
- ^ ΔfG°, -1039.18 kJ · mol−1
- ^ S°, 234.3 J · K−1 · mol−1
- ^ Cp°, -63. J · K−1 · mol−1