Na2CO3 + H4SiO4 🔥→ Na2SiO3 + CO2↑ + 2H2O
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- Reaction of sodium carbonate and silicic acid
- Na2CO3Sodium carbonate + H4SiO4Silicic acidNa2SiO3Sodium metasilicate + CO2↑Carbon dioxide + 2H2OWater🔥⟶
The reaction of sodium carbonate and silicic acid yields sodium metasilicate, carbon dioxide, and water. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of sodium carbonate and silicic acid
- Na2CO3Sodium carbonate + H4SiO4Silicic acidNa2SiO3Sodium metasilicate + CO2↑Carbon dioxide + 2H2OWater🔥⟶
General equation
- Salt of volatile acidBrønsted base + Nonvolatile acidBrønsted acid ⟶ Salt of non volatile acidConjugate base + Volatile acidic oxide + H2OConjugate acid
Oxidation state of each atom
- Reaction of sodium carbonate and silicic acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2CO3 | Sodium carbonate | 1 | Brønsted base | Salt of volatile acid |
| H4SiO4 | Silicic acid | 1 | Brønsted acid | Nonvolatile acid |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2SiO3 | Sodium metasilicate | 1 | Conjugate base | Salt of non volatile acid |
| CO2 | Carbon dioxide | 1 | – | Volatile acidic oxide |
| H2O | Water | 2 | Conjugate acid | Water |
Thermodynamic changes
Changes in standard condition
- Reaction of sodium carbonate and silicic acid◆
ΔrG 45.9 kJ/mol K 0.91 × 10−8 pK 8.04
| 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 | 91.7 | 45.9 | 140 | – |
per 1 mol of | 91.7 | 45.9 | 140 | – |
per 1 mol of Silicic acid | 91.7 | 45.9 | 140 | – |
per 1 mol of | 91.7 | 45.9 | 140 | – |
per 1 mol of | 91.7 | 45.9 | 140 | – |
per 1 mol of | 45.9 | 22.9 | 70.0 | – |
Changes in aqueous solution (1)
- Reaction of sodium carbonate and silicic acid
| 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 | 74.6 | – | – | – |
per 1 mol of | 74.6 | – | – | – |
per 1 mol of Silicic acid | 74.6 | – | – | – |
per 1 mol of | 74.6 | – | – | – |
per 1 mol of | 74.6 | – | – | – |
per 1 mol of | 37.3 | – | – | – |
Changes in aqueous solution (2)
- Reaction of sodium carbonate and silicic acid
| 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 | 54.3 | – | – | – |
per 1 mol of | 54.3 | – | – | – |
per 1 mol of Silicic acid | 54.3 | – | – | – |
per 1 mol of | 54.3 | – | – | – |
per 1 mol of | 54.3 | – | – | – |
per 1 mol of | 27.1 | – | – | – |
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 |
|---|---|---|---|---|
| Na2CO3 (cr) | -1130.68[1] | -1044.44[1] | 134.98[1] | 112.30[1] |
| Na2CO3 (ai) | -1157.38[1] | -1051.64[1] | 61.1[1] | – |
| Na2CO3 (cr) 1 hydrate | -1431.26[1] | -1285.31[1] | 168.11[1] | 145.60[1] |
| Na2CO3 (cr) 7 hydrate | -3199.96[1] | -2714.2[1] | 422.2[1] | – |
| Na2CO3 (cr) 10 hydrate | -4081.32[1] | -3427.66[1] | 562.7[1] | 550.32[1] |
| H4SiO4 (cr) | -1481.1[1] | -1332.9[1] | 192[1] | – |
| H4SiO4 (ao) | -1468.6[1] | -1316.6[1] | 180[1] | – |
* (cr):Crystalline solid, (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 |
|---|---|---|---|---|
| Na2SiO3 (cr) | -1554.90[1] | -1462.80[1] | 113.85[1] | – |
| Na2SiO3 (vit) | -1540.1[1] | – | – | – |
| Na2SiO3 (aq) | -1586.2[1] | – | – | – |
| Na2SiO3 (cr) 5 hydrate | -3048.5[1] | – | – | – |
| Na2SiO3 (cr) 9 hydrate | -4228.8[1] | – | – | – |
| CO2 (g) | -393.509[1] | -394.359[1] | 213.74[1] | 37.11[1] |
| CO2 (ao) | -413.80[1] | -385.98[1] | 117.6[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, (vit):Vitreous liquid, (aq):Aqueous solution, (g):Gas, (ao):Un-ionized aqueous solution, (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°, -1130.68 kJ · mol−1
- ^ ΔfG°, -1044.44 kJ · mol−1
- ^ S°, 134.98 J · K−1 · mol−1
- ^ Cp°, 112.30 J · K−1 · mol−1
- ^ ΔfH°, -1157.38 kJ · mol−1
- ^ ΔfG°, -1051.64 kJ · mol−1
- ^ S°, 61.1 J · K−1 · mol−1
- ^ ΔfH°, -1431.26 kJ · mol−1
- ^ ΔfG°, -1285.31 kJ · mol−1
- ^ S°, 168.11 J · K−1 · mol−1
- ^ Cp°, 145.60 J · K−1 · mol−1
- ^ ΔfH°, -3199.96 kJ · mol−1
- ^ ΔfG°, -2714.2 kJ · mol−1
- ^ S°, 422.2 J · K−1 · mol−1
- ^ ΔfH°, -4081.32 kJ · mol−1
- ^ ΔfG°, -3427.66 kJ · mol−1
- ^ S°, 562.7 J · K−1 · mol−1
- ^ Cp°, 550.32 J · K−1 · mol−1
- ^ ΔfH°, -1481.1 kJ · mol−1
- ^ ΔfG°, -1332.9 kJ · mol−1
- ^ S°, 192. J · K−1 · mol−1
- ^ ΔfH°, -1468.6 kJ · mol−1
- ^ ΔfG°, -1316.6 kJ · mol−1
- ^ S°, 180. J · K−1 · mol−1
- ^ ΔfH°, -1554.90 kJ · mol−1
- ^ ΔfG°, -1462.80 kJ · mol−1
- ^ S°, 113.85 J · K−1 · mol−1
- ^ ΔfH°, -1540.1 kJ · mol−1
- ^ ΔfH°, -1586.2 kJ · mol−1
- ^ ΔfH°, -3048.5 kJ · mol−1
- ^ ΔfH°, -4228.8 kJ · mol−1
- ^ ΔfH°, -393.509 kJ · mol−1
- ^ ΔfG°, -394.359 kJ · mol−1
- ^ S°, 213.74 J · K−1 · mol−1
- ^ Cp°, 37.11 J · K−1 · mol−1
- ^ ΔfH°, -413.80 kJ · mol−1
- ^ ΔfG°, -385.98 kJ · mol−1
- ^ S°, 117.6 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