CaS + H2SiO3 🔥→ CaSiO3 + H2S↑
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The reaction of calcium sulfide and metasilicic acid yields calcium metasilicate and hydrogen sulfide. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of calcium sulfide and metasilicic acid
General equation
- Salt of volatile acidBrønsted base + Nonvolatile acidBrønsted acid ⟶ Salt of non volatile acidConjugate base + Volatile acidConjugate acid
Oxidation state of each atom
- Reaction of calcium sulfide and metasilicic acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaS | Calcium sulfide | 1 | Brønsted base | Salt of volatile acid |
| H2SiO3 | Metasilicic acid | 1 | Brønsted acid | Nonvolatile acid |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaSiO3 | Calcium metasilicate | 1 | Conjugate base | Salt of non volatile acid |
| H2S | Hydrogen sulfide | 1 | Conjugate acid | Volatile acid |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of calcium sulfide and metasilicic acid◆
ΔrG −13.4 kJ/mol K 2.23 × 102 pK −2.35
| 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 | 15.5 | −13.4 | 97 | – |
per 1 mol of | 15.5 | −13.4 | 97 | – |
per 1 mol of | 15.5 | −13.4 | 97 | – |
per 1 mol of | 15.5 | −13.4 | 97 | – |
per 1 mol of | 15.5 | −13.4 | 97 | – |
Changes in standard condition (2)
- Reaction of calcium sulfide and metasilicic acid◆
ΔrG −8.5 kJ/mol K 3.08 × 101 pK −1.49
| 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 | 22.1 | −8.5 | 103 | – |
per 1 mol of | 22.1 | −8.5 | 103 | – |
per 1 mol of | 22.1 | −8.5 | 103 | – |
per 1 mol of | 22.1 | −8.5 | 103 | – |
per 1 mol of | 22.1 | −8.5 | 103 | – |
Changes in aqueous solution (1)
- Reaction of calcium sulfide and metasilicic acid◆
ΔrG −26.4 kJ/mol K 4.22 × 104 pK −4.63
| 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 | 9.6 | −26.4 | 122 | – |
per 1 mol of | 9.6 | −26.4 | 122 | – |
per 1 mol of | 9.6 | −26.4 | 122 | – |
per 1 mol of | 9.6 | −26.4 | 122 | – |
per 1 mol of | 9.6 | −26.4 | 122 | – |
Changes in aqueous solution (2)
- Reaction of calcium sulfide and metasilicic acid◆
ΔrG −20.7 kJ/mol K 4.23 × 103 pK −3.63
| 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 | −9.4 | −20.7 | 37 | – |
per 1 mol of | −9.4 | −20.7 | 37 | – |
per 1 mol of | −9.4 | −20.7 | 37 | – |
per 1 mol of | −9.4 | −20.7 | 37 | – |
per 1 mol of | −9.4 | −20.7 | 37 | – |
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 |
|---|---|---|---|---|
| CaS (cr) | -482.4[1] | -477.4[1] | 56.5[1] | 47.40[1] |
| CaS (g) | – | – | – | – |
| H2SiO3 (cr) | -1188.7[1] | -1092.4[1] | 134[1] | – |
| H2SiO3 (ao) | -1182.8[1] | -1079.4[1] | 109[1] | – |
* (cr):Crystalline solid, (g):Gas, (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 |
|---|---|---|---|---|
| CaSiO3 (cr) wollastonite | -1634.94[1] | -1549.66[1] | 81.92[1] | 85.27[1] |
| CaSiO3 (cr) pseudowollastonite | -1628.4[1] | -1544.7[1] | 87.36[1] | 86.48[1] |
| CaSiO3 (vit) | -1601.01[1] | – | – | – |
| H2S (g) | -20.63[1] | -33.56[1] | 205.79[1] | 34.23[1] |
| H2S (ao) | -39.7[1] | -27.83[1] | 121[1] | – |
* (cr):Crystalline solid, (vit):Vitreous liquid, (g):Gas, (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°, -482.4 kJ · mol−1
- ^ ΔfG°, -477.4 kJ · mol−1
- ^ S°, 56.5 J · K−1 · mol−1
- ^ Cp°, 47.40 J · K−1 · mol−1
- ^ ΔfH°, -1188.7 kJ · mol−1
- ^ ΔfG°, -1092.4 kJ · mol−1
- ^ S°, 134. J · K−1 · mol−1
- ^ ΔfH°, -1182.8 kJ · mol−1
- ^ ΔfG°, -1079.4 kJ · mol−1
- ^ S°, 109. J · K−1 · mol−1
- ^ ΔfH°, -1634.94 kJ · mol−1
- ^ ΔfG°, -1549.66 kJ · mol−1
- ^ S°, 81.92 J · K−1 · mol−1
- ^ Cp°, 85.27 J · K−1 · mol−1
- ^ ΔfH°, -1628.4 kJ · mol−1
- ^ ΔfG°, -1544.7 kJ · mol−1
- ^ S°, 87.36 J · K−1 · mol−1
- ^ Cp°, 86.48 J · K−1 · mol−1
- ^ ΔfH°, -1601.01 kJ · mol−1
- ^ ΔfH°, -20.63 kJ · mol−1
- ^ ΔfG°, -33.56 kJ · mol−1
- ^ S°, 205.79 J · K−1 · mol−1
- ^ Cp°, 34.23 J · K−1 · mol−1
- ^ ΔfH°, -39.7 kJ · mol−1
- ^ ΔfG°, -27.83 kJ · mol−1
- ^ S°, 121. J · K−1 · mol−1