FeS + 2RbOH 🔥→ Rb2S + Fe(OH)2
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The reaction of iron(II) sulfide and rubidium hydroxide yields rubidium sulfide and iron(II) hydroxide. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of iron(II) sulfide and rubidium hydroxide
General equation
- Reaction of salt of weak base and strong base
- Salt of weak baseBrønsted acid + Strong baseBrønsted base ⟶ Salt of strong baseConjugate acid + Weak baseConjugate base + (H2O)
Oxidation state of each atom
- Reaction of iron(II) sulfide and rubidium hydroxide
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| FeS | Iron(II) sulfide | 1 | Brønsted acid | Salt of weak base |
| RbOH | Rubidium hydroxide | 2 | Brønsted base | Strong base |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Rb2S | Rubidium sulfide | 1 | Conjugate acid | Salt of strong base |
| Fe(OH)2 | Iron(II) hydroxide | 1 | Conjugate base | Weak base |
Thermodynamic changes
Changes in standard condition
- Reaction of iron(II) sulfide and rubidium hydroxide
| 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 | 6.7 | – | – | – |
per 1 mol of | 6.7 | – | – | – |
per 1 mol of | 3.4 | – | – | – |
per 1 mol of | 6.7 | – | – | – |
per 1 mol of | 6.7 | – | – | – |
Changes in aqueous solution
- Reaction of iron(II) sulfide and rubidium hydroxide◆
ΔrG 14.3 kJ/mol K 0.31 × 10−2 pK 2.51
| 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 | 23.9 | 14.3 | 35 | – |
per 1 mol of | 23.9 | 14.3 | 35 | – |
per 1 mol of | 11.9 | 7.15 | 18 | – |
per 1 mol of | 23.9 | 14.3 | 35 | – |
per 1 mol of | 23.9 | 14.3 | 35 | – |
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 |
|---|---|---|---|---|
| FeS (cr) iron-rich pyrrhotite, α | -100.0[1] | -100.4[1] | 60.29[1] | 50.54[1] |
| RbOH (cr) | -418.19[1] | – | – | – |
| RbOH (g) | -238[1] | – | – | – |
| RbOH (ai) | -481.16[1] | -441.21[1] | 110.75[1] | – |
| RbOH (cr) 1 hydrate | -748.85[1] | – | – | – |
| RbOH (cr) 2 hydrate | -1053.24[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 |
|---|---|---|---|---|
| Rb2S (cr) | -360.7[1] | – | – | – |
| Rb2S (ai) | -469.4[1] | -482.0[1] | 228.4[1] | – |
| Fe(OH)2 (cr) precipitated | -569.0[1] | -486.5[1] | 88[1] | – |
| Fe(OH)2 (g) | -372[1] | – | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas
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°, -100.0 kJ · mol−1
- ^ ΔfG°, -100.4 kJ · mol−1
- ^ S°, 60.29 J · K−1 · mol−1
- ^ Cp°, 50.54 J · K−1 · mol−1
- ^ ΔfH°, -418.19 kJ · mol−1
- ^ ΔfH°, -238. kJ · mol−1
- ^ ΔfH°, -481.16 kJ · mol−1
- ^ ΔfG°, -441.21 kJ · mol−1
- ^ S°, 110.75 J · K−1 · mol−1
- ^ ΔfH°, -748.85 kJ · mol−1
- ^ ΔfH°, -1053.24 kJ · mol−1
- ^ ΔfH°, -360.7 kJ · mol−1
- ^ ΔfH°, -469.4 kJ · mol−1
- ^ ΔfG°, -482.0 kJ · mol−1
- ^ S°, 228.4 J · K−1 · mol−1
- ^ ΔfH°, -569.0 kJ · mol−1
- ^ ΔfG°, -486.5 kJ · mol−1
- ^ S°, 88. J · K−1 · mol−1
- ^ ΔfH°, -372. kJ · mol−1