11H2S + Ca3(AsO4)2 ๐ฅโ 8S + 2AsH3 + 3CaS + 8H2O
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- Reaction of hydrogen sulfide and calcium arsenate
The reaction of hydrogen sulfide and calcium arsenate yields , , calcium sulfide, 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 hydrogen sulfide and calcium arsenate
General equation
- Reaction of reducing species and reducible species
- Reducing speciesReducing agent + Reducible speciesOxidizing agent โถ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of hydrogen sulfide and calcium arsenate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| H2S | Hydrogen sulfide | 11 | Reducing | Reducing |
| Ca3(AsO4)2 | Calcium arsenate | 1 | Oxidizing | Reducible |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| 8 | Oxidized | โ | ||
| 2 | Reduced | โ | ||
| CaS | Calcium sulfide | 3 | โ | โ |
| H2O | Water | 8 | โ | โ |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of hydrogen sulfide and calcium arsenateโ
ฮrG 240.8 kJ/mol K 0.65 ร 10โ42 pK 42.19 - 11H2SGas + Ca3(AsO4)2Crystalline solid8Crystalline solidrhombic + 2Gas + 3CaSCrystalline solid + 8H2OLiquid๐ฅโถ
| 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 | โ75.3 | 240.8 | โ1061 | โ |
per 1 mol of | โ6.85 | 21.89 | โ96.45 | โ |
per 1 mol of | โ75.3 | 240.8 | โ1061 | โ |
| โ9.41 | 30.10 | โ132.6 | โ | |
| โ37.6 | 120.4 | โ530.5 | โ | |
per 1 mol of | โ25.1 | 80.27 | โ353.7 | โ |
per 1 mol of | โ9.41 | 30.10 | โ132.6 | โ |
Changes in standard condition (2)
- Reaction of hydrogen sulfide and calcium arsenate
- 11H2SGas + Ca3(AsO4)2Crystalline solid8Crystalline solidmonoclinic + 2Gas + 3CaSCrystalline solid + 8H2OLiquid๐ฅโถ
| 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 | โ72.7 | โ | โ | โ |
per 1 mol of | โ6.61 | โ | โ | โ |
per 1 mol of | โ72.7 | โ | โ | โ |
| โ9.09 | โ | โ | โ | |
| โ36.4 | โ | โ | โ | |
per 1 mol of | โ24.2 | โ | โ | โ |
per 1 mol of | โ9.09 | โ | โ | โ |
Changes in aqueous solution
- Reaction of hydrogen sulfide and calcium arsenateโ
ฮrG 177.8 kJ/mol K 0.71 ร 10โ31 pK 31.15 - 11H2SUn-ionized aqueous solution + Ca3(AsO4)2Crystalline solid8Crystalline solidrhombic + 2Gas + 3CaSCrystalline solid + 8H2OLiquid๐ฅโถ
| 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 | 134.4 | 177.8 | โ128 | โ |
per 1 mol of | 12.22 | 16.16 | โ11.6 | โ |
per 1 mol of | 134.4 | 177.8 | โ128 | โ |
| 16.80 | 22.23 | โ16.0 | โ | |
| 67.20 | 88.90 | โ64.0 | โ | |
per 1 mol of | 44.80 | 59.27 | โ42.7 | โ |
per 1 mol of | 16.80 | 22.23 | โ16.0 | 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 |
|---|---|---|---|---|
| H2S (g) | -20.63[1] | -33.56[1] | 205.79[1] | 34.23[1] |
| H2S (ao) | -39.7[1] | -27.83[1] | 121[1] | โ |
| Ca3(AsO4)2 (cr) | -3298.7[1] | -3063.0[1] | 226[1] | โ |
| Ca3(AsO4)2 (cr) hydrated precipitate | -3343[1] | โ | โ | โ |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid
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 |
|---|---|---|---|---|
| (cr) rhombic | 0[1] | 0[1] | 31.80[1] | 22.64[1] |
| (cr) monoclinic | 0.33[1] | โ | โ | โ |
| (g) | 278.805[1] | 238.250[1] | 167.821[1] | 23.673[1] |
| (g) | 66.44[1] | 68.93[1] | 222.78[1] | 38.07[1] |
| CaS (cr) | -482.4[1] | -477.4[1] | 56.5[1] | 47.40[1] |
| CaS (g) | โ | โ | 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, (g):Gas, (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)
- ^ ฮfHยฐ, -20.63 kJ ยท molโ1
- ^ ฮfGยฐ, -33.56 kJ ยท molโ1
- ^ Sยฐ, 205.79 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 34.23 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -39.7 kJ ยท molโ1
- ^ ฮfGยฐ, -27.83 kJ ยท molโ1
- ^ Sยฐ, 121. J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -3298.7 kJ ยท molโ1
- ^ ฮfGยฐ, -3063.0 kJ ยท molโ1
- ^ Sยฐ, 226. J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -3343. kJ ยท molโ1
- ^ ฮfHยฐ, 0 kJ ยท molโ1
- ^ ฮfGยฐ, 0 kJ ยท molโ1
- ^ Sยฐ, 31.80 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 22.64 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 0.33 kJ ยท molโ1
- ^ ฮfHยฐ, 278.805 kJ ยท molโ1
- ^ ฮfGยฐ, 238.250 kJ ยท molโ1
- ^ Sยฐ, 167.821 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 23.673 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, 66.44 kJ ยท molโ1
- ^ ฮfGยฐ, 68.93 kJ ยท molโ1
- ^ Sยฐ, 222.78 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 38.07 J ยท Kโ1 ยท molโ1
- ^ ฮfHยฐ, -482.4 kJ ยท molโ1
- ^ ฮfGยฐ, -477.4 kJ ยท molโ1
- ^ Sยฐ, 56.5 J ยท Kโ1 ยท molโ1
- ^ Cpยฐ, 47.40 J ยท Kโ1 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