H2S + Hg(OH)2 → HgS + 2H2O
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- Reaction of hydrogen sulfide and mercury(II) hydroxide
The reaction of hydrogen sulfide and mercury(II) hydroxide yields mercury(II) sulfide and water (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 hydrogen sulfide and mercury(II) hydroxide
General equation
- Reaction of acid and base
- AcidBrønsted acid + BaseBrønsted base ⟶ SaltConjugate base + (H2O)(Conjugate acid)
- Reaction of acid and hydroxide base
- AcidBrønsted acid + Hydroxide baseBrønsted base ⟶ SaltConjugate base + H2OConjugate acid
- Reaction of weak acid and weak base
- Weak acidBrønsted acid + Weak baseBrønsted base ⟶ Salt of weak acid and weak baseConjugate base + (H2O)(Conjugate acid)
Oxidation state of each atom
- Reaction of hydrogen sulfide and mercury(II) hydroxide
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| H2S | Hydrogen sulfide | 1 | Brønsted acid | Acid Weak acid |
| Hg(OH)2 | Mercury(II) hydroxide | 1 | Brønsted base | Base Hydroxide base Weak base |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| HgS | Mercury(II) sulfide | 1 | Conjugate base | Salt Salt of weak acid and weak base |
| H2O | Water | 2 | Conjugate acid | Water |
Thermodynamic changes
Changes in aqueous solution
- Reaction of hydrogen sulfide and mercury(II) hydroxide◆
ΔrG −222.2 kJ/mol K 8.47 × 1038 pK −38.93
| 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 | −235.0 | −222.2 | −41 | – |
per 1 mol of | −235.0 | −222.2 | −41 | – |
per 1 mol of Mercury(II) hydroxide | −235.0 | −222.2 | −41 | – |
per 1 mol of | −235.0 | −222.2 | −41 | – |
per 1 mol of | −117.5 | −111.1 | −21 | – |
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 |
|---|---|---|---|---|
| H2S (g) | -20.63[1] | -33.56[1] | 205.79[1] | 34.23[1] |
| H2S (ao) | -39.7[1] | -27.83[1] | 121[1] | – |
| Hg(OH)2 (ao) | -355.2[1] | -274.8[1] | 142[1] | – |
* (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 |
|---|---|---|---|---|
| HgS (cr) red | -58.2[1] | -50.6[1] | 82.4[1] | 48.41[1] |
| HgS (cr) black | -53.6[1] | -47.7[1] | 88.3[1] | – |
| HgS (g) | – | – | 254.75[1] | – |
| H2O (cr) | – | – | – | – |
| 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)
- ^ 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
- ^ ΔfH°, -355.2 kJ · mol−1
- ^ ΔfG°, -274.8 kJ · mol−1
- ^ S°, 142. J · K−1 · mol−1
- ^ ΔfH°, -58.2 kJ · mol−1
- ^ ΔfG°, -50.6 kJ · mol−1
- ^ S°, 82.4 J · K−1 · mol−1
- ^ Cp°, 48.41 J · K−1 · mol−1
- ^ ΔfH°, -53.6 kJ · mol−1
- ^ ΔfG°, -47.7 kJ · mol−1
- ^ S°, 88.3 J · K−1 · mol−1
- ^ S°, 254.75 J · K−1 · mol−1
- ^ ΔfH°, -285.830 kJ · mol−1
- ^ ΔfG°, -237.129 kJ · mol−1
- ^ S°, 69.91 J · K−1 · mol−1
- ^ Cp°, 75.291 J · K−1 · mol−1
- ^ ΔfH°, -241.818 kJ · mol−1
- ^ ΔfG°, -228.572 kJ · mol−1
- ^ S°, 188.825 J · K−1 · mol−1
- ^ Cp°, 33.577 J · K−1 · mol−1