2NaNO3 + 4H3BO3 🔥→ Na2B4O7 + N2O5 + 6H2O
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- Reaction of sodium nitrate and boric acid
The reaction of sodium nitrate and boric acid yields sodium tetraborate, dinitrogen pentaoxide, and water. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of sodium nitrate and boric acid
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 nitrate and boric acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| NaNO3 | Sodium nitrate | 2 | Brønsted base | Salt of volatile acid |
| H3BO3 | Boric acid | 4 | Brønsted acid | Nonvolatile acid |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2B4O7 | Sodium tetraborate | 1 | Conjugate base | Salt of non volatile acid |
| N2O5 | Dinitrogen pentaoxide | 1 | – | Volatile acidic oxide |
| H2O | Water | 6 | Conjugate acid | Water |
Thermodynamic changes
Changes in aqueous solution
- Reaction of sodium nitrate and boric acid◆
ΔrG 183.7 kJ/mol K 0.66 × 10−32 pK 32.18
| 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 | – | 183.7 | – | – |
per 1 mol of | – | 91.85 | – | – |
per 1 mol of | – | 45.92 | – | – |
per 1 mol of | – | 183.7 | – | – |
per 1 mol of | – | 183.7 | – | – |
per 1 mol of | – | 30.62 | – | – |
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 |
|---|---|---|---|---|
| NaNO3 (cr) | -467.85[1] | -367.00[1] | 116.52[1] | 92.88[1] |
| NaNO3 (ai) | -447.48[1] | -373.15[1] | 205.4[1] | -40.2[1] |
| H3BO3 (cr) | -1094.33[1] | -968.92[1] | 88.83[1] | 81.38[1] |
| H3BO3 (g) | -994.1[1] | – | – | – |
| H3BO3 (ao) | -1072.32[1] | -968.75[1] | 162.3[1] | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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 |
|---|---|---|---|---|
| Na2B4O7 (cr) | -3291.1[1] | -3096.0[1] | 189.54[1] | 186.77[1] |
| Na2B4O7 (am) | -3271.1[1] | -3076.8[1] | 192.9[1] | – |
| Na2B4O7 (ai) | – | -3128.7[1] | – | – |
| Na2B4O7 (cr) 4 hydrate | -4507.4[1] | – | – | – |
| Na2B4O7 (cr) 5 hydrate | -4802.4[1] | – | – | – |
| Na2B4O7 (cr) 10 hydrate | -6288.6[1] | -5516.0[1] | 586[1] | 615[1] |
| N2O5 (cr) | -43.1[1] | 113.9[1] | 178.2[1] | 143.1[1] |
| N2O5 (g) | 11.3[1] | 115.1[1] | 355.7[1] | 84.5[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, (am):Amorphous solid, (ai):Ionized aqueous solution, (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°, -467.85 kJ · mol−1
- ^ ΔfG°, -367.00 kJ · mol−1
- ^ S°, 116.52 J · K−1 · mol−1
- ^ Cp°, 92.88 J · K−1 · mol−1
- ^ ΔfH°, -447.48 kJ · mol−1
- ^ ΔfG°, -373.15 kJ · mol−1
- ^ S°, 205.4 J · K−1 · mol−1
- ^ Cp°, -40.2 J · K−1 · mol−1
- ^ ΔfH°, -1094.33 kJ · mol−1
- ^ ΔfG°, -968.92 kJ · mol−1
- ^ S°, 88.83 J · K−1 · mol−1
- ^ Cp°, 81.38 J · K−1 · mol−1
- ^ ΔfH°, -994.1 kJ · mol−1
- ^ ΔfH°, -1072.32 kJ · mol−1
- ^ ΔfG°, -968.75 kJ · mol−1
- ^ S°, 162.3 J · K−1 · mol−1
- ^ ΔfH°, -3291.1 kJ · mol−1
- ^ ΔfG°, -3096.0 kJ · mol−1
- ^ S°, 189.54 J · K−1 · mol−1
- ^ Cp°, 186.77 J · K−1 · mol−1
- ^ ΔfH°, -3271.1 kJ · mol−1
- ^ ΔfG°, -3076.8 kJ · mol−1
- ^ S°, 192.9 J · K−1 · mol−1
- ^ ΔfG°, -3128.7 kJ · mol−1
- ^ ΔfH°, -4507.4 kJ · mol−1
- ^ ΔfH°, -4802.4 kJ · mol−1
- ^ ΔfH°, -6288.6 kJ · mol−1
- ^ ΔfG°, -5516.0 kJ · mol−1
- ^ S°, 586. J · K−1 · mol−1
- ^ Cp°, 615. J · K−1 · mol−1
- ^ ΔfH°, -43.1 kJ · mol−1
- ^ ΔfG°, 113.9 kJ · mol−1
- ^ S°, 178.2 J · K−1 · mol−1
- ^ Cp°, 143.1 J · K−1 · mol−1
- ^ ΔfH°, 11.3 kJ · mol−1
- ^ ΔfG°, 115.1 kJ · mol−1
- ^ S°, 355.7 J · K−1 · mol−1
- ^ Cp°, 84.5 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