H3SiO4− → H2SiO3 + OH−
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- Electrolytic dissociation of trihydrogensilicate ion
Electrolytic dissociation of trihydrogensilicate ion yields metasilicic acid and hydroxide ion (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Electrolytic dissociation of trihydrogensilicate ion
General equation
- Electrolytic dissociation of ion
- Polyatomic ion ⟶ Cation/Electrically neutral + Anion/Electrically neutral
Oxidation state of each atom
- Electrolytic dissociation of trihydrogensilicate ion
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| H3SiO4− | Trihydrogensilicate ion | 1 | – | Polyatomic ion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| H2SiO3 | Metasilicic acid | 1 | – | Electrically neutral |
| OH− | Hydroxide ion | 1 | – | Anion |
Thermodynamic changes
Changes in standard condition
- Electrolytic dissociation of trihydrogensilicate ion◆
ΔrG 16.5 kJ/mol K 0.13 × 10−2 pK 2.89 - H3SiO4−Un-ionized aqueous solutionH2SiO3Un-ionized aqueous solution + OH−Un-ionized aqueous solution⟶
| 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 | 20.3 | 16.5 | 12 | – |
per 1 mol of Trihydrogensilicate ion | 20.3 | 16.5 | 12 | – |
per 1 mol of | 20.3 | 16.5 | 12 | – |
per 1 mol of Hydroxide ion | 20.3 | 16.5 | 12 | – |
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 |
|---|---|---|---|---|
| H3SiO4− (ao) | -1433.083[1] | -1253.155[1] | 86.65[1] | – |
* (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 |
|---|---|---|---|---|
| H2SiO3 (cr) | -1188.7[2] | -1092.4[2] | 134[2] | – |
| H2SiO3 (ao) | -1182.8[2] | -1079.4[2] | 109[2] | – |
| OH− (g) | -143.5[2] | – | – | – |
| OH− (ao) | -229.994[2] | -157.244[2] | -10.75[2] | -148.5[2] |
* (cr):Crystalline solid, (ao):Un-ionized aqueous solution, (g):Gas
References
List of references
- 1Colin Stuart Walker, Anraku Sohtaro, Oda Chie, Mitsui Seiichiro, Mihara MorihiroThermodynamic properties of SiO2(aq), HSiO3– and SiO3-2Japan Atomic Energy Agency
- 2Janiel 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)