MgBr2 + H2SiO3 🔥→ MgSiO3 + 2HBr↑
Last updated:
The reaction of magnesium bromide and metasilicic acid yields magnesium metasilicate and hydrogen bromide. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of magnesium bromide 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 magnesium bromide and metasilicic acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| MgBr2 | Magnesium bromide | 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 |
|---|---|---|---|---|
| MgSiO3 | Magnesium metasilicate | 1 | Conjugate base | Salt of non volatile acid |
| HBr | Hydrogen bromide | 2 | Conjugate acid | Volatile acid |
Thermodynamic changes
Changes in standard condition
- Reaction of magnesium bromide and metasilicic acid◆
ΔrG 27.2 kJ/mol K 0.17 × 10−4 pK 4.77
| 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 | 91.2 | 27.2 | 214 | – |
per 1 mol of | 91.2 | 27.2 | 214 | – |
per 1 mol of | 91.2 | 27.2 | 214 | – |
per 1 mol of | 91.2 | 27.2 | 214 | – |
per 1 mol of | 45.6 | 13.6 | 107 | – |
Changes in aqueous solution (1)
- Reaction of magnesium bromide and metasilicic acid◆
ΔrG 173.1 kJ/mol K 0.47 × 10−30 pK 30.33
| 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 | 270.9 | 173.1 | 329 | – |
per 1 mol of | 270.9 | 173.1 | 329 | – |
per 1 mol of | 270.9 | 173.1 | 329 | – |
per 1 mol of | 270.9 | 173.1 | 329 | – |
per 1 mol of | 135.4 | 86.55 | 165 | – |
Changes in aqueous solution (2)
- Reaction of magnesium bromide and metasilicic acid◆
ΔrG 72.1 kJ/mol K 0.23 × 10−12 pK 12.63
| 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 | 100.6 | 72.1 | 97 | – |
per 1 mol of | 100.6 | 72.1 | 97 | – |
per 1 mol of | 100.6 | 72.1 | 97 | – |
per 1 mol of | 100.6 | 72.1 | 97 | – |
per 1 mol of | 50.30 | 36.0 | 49 | – |
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 |
|---|---|---|---|---|
| MgBr2 (cr) | -524.3[1] | -503.8[1] | 117.2[1] | – |
| MgBr2 (g) | -309.6[1] | – | – | – |
| MgBr2 (ai) | -709.94[1] | -662.7[1] | 26.8[1] | – |
| MgBr2 (cr) 6 hydrate | -2410.0[1] | -2055.7[1] | 397[1] | – |
| 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, (ai):Ionized aqueous solution, (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 |
|---|---|---|---|---|
| MgSiO3 (cr) | -1549.00[1] | -1462.09[1] | 67.74[1] | 81.38[1] |
| HBr (g) | -36.40[1] | -53.45[1] | 198.695[1] | 29.142[1] |
| HBr (ai) | -121.55[1] | -103.96[1] | 82.4[1] | -141.8[1] |
* (cr):Crystalline solid, (g):Gas, (ai):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°, -524.3 kJ · mol−1
- ^ ΔfG°, -503.8 kJ · mol−1
- ^ S°, 117.2 J · K−1 · mol−1
- ^ ΔfH°, -309.6 kJ · mol−1
- ^ ΔfH°, -709.94 kJ · mol−1
- ^ ΔfG°, -662.7 kJ · mol−1
- ^ S°, 26.8 J · K−1 · mol−1
- ^ ΔfH°, -2410.0 kJ · mol−1
- ^ ΔfG°, -2055.7 kJ · mol−1
- ^ S°, 397. 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°, -1549.00 kJ · mol−1
- ^ ΔfG°, -1462.09 kJ · mol−1
- ^ S°, 67.74 J · K−1 · mol−1
- ^ Cp°, 81.38 J · K−1 · mol−1
- ^ ΔfH°, -36.40 kJ · mol−1
- ^ ΔfG°, -53.45 kJ · mol−1
- ^ S°, 198.695 J · K−1 · mol−1
- ^ Cp°, 29.142 J · K−1 · mol−1
- ^ ΔfH°, -121.55 kJ · mol−1
- ^ ΔfG°, -103.96 kJ · mol−1
- ^ S°, 82.4 J · K−1 · mol−1
- ^ Cp°, -141.8 J · K−1 · mol−1