3Na2HPO4 + 3NH3 🔥→ 2Na3PO4 + (NH4)3PO4
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The reaction of sodium hydrogenphosphate and ammonia yields sodium phosphate and ammonium phosphate. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of sodium hydrogenphosphate and ammonia
General equation
- Reaction of acid salt and base
- Acid saltBrønsted acid + BaseBrønsted base ⟶ SaltConjugate base + (H2O)
- Reaction of acid salt and non hydroxide base
- Acid saltBrønsted acid + Non hydroxide baseBrønsted base ⟶ SaltConjugate acid base
Oxidation state of each atom
- Reaction of sodium hydrogenphosphate and ammonia
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2HPO4 | Sodium hydrogenphosphate | 3 | Brønsted acid | Acid salt |
| NH3 | Ammonia | 3 | Brønsted base | Base Non hydroxide base |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na3PO4 | Sodium phosphate | 2 | Conjugate base Conjugate acid base | Salt |
| (NH4)3PO4 | Ammonium phosphate | 1 | Conjugate base Conjugate acid base | Salt |
Thermodynamic changes
Changes in standard condition
- Reaction of sodium hydrogenphosphate and ammonia
| 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 | −124.1 | – | – | – |
per 1 mol of | −41.37 | – | – | – |
per 1 mol of | −41.37 | – | – | – |
per 1 mol of | −62.05 | – | – | – |
per 1 mol of | −124.1 | – | – | – |
Changes in aqueous solution
- Reaction of sodium hydrogenphosphate and ammonia◆
ΔrG 52.8 kJ/mol K 0.56 × 10−9 pK 9.25
| 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 | −112.7 | 52.8 | −557 | – |
per 1 mol of | −37.57 | 17.6 | −186 | – |
per 1 mol of | −37.57 | 17.6 | −186 | – |
per 1 mol of | −56.35 | 26.4 | −279 | – |
per 1 mol of | −112.7 | 52.8 | −557 | – |
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 |
|---|---|---|---|---|
| Na2HPO4 (cr) | -1748.1[1] | -1608.2[1] | 150.50[1] | 135.31[1] |
| Na2HPO4 (ai) | -1772.38[1] | -1612.98[1] | 84.5[1] | – |
| Na2HPO4 (cr) 2 hydrate | -2346.0[1] | -2088.5[1] | 221.3[1] | – |
| Na2HPO4 (cr) 7 hydrate | -3821.7[1] | -3279.8[1] | 434.59[1] | – |
| Na2HPO4 (cr) 12 hydrate | -5297.8[1] | -4467.8[1] | 633.83[1] | – |
| NH3 (g) | -46.11[1] | -16.45[1] | 192.45[1] | 35.06[1] |
| NH3 (ao) | -80.29[1] | -26.50[1] | 111.3[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 |
|---|---|---|---|---|
| Na3PO4 (cr) | -1917.40[1] | -1788.80[1] | 173.80[1] | 153.47[1] |
| Na3PO4 (ai) | -1997.9[1] | -1804.5[1] | -43.3[1] | – |
| (NH4)3PO4 (cr) | -1671.9[1] | – | – | – |
| (NH4)3PO4 (ai) | -1674.9[1] | -1256.6[1] | 117[1] | – |
| (NH4)3PO4 (cr) 3 hydrate | -2555.6[1] | – | – | – |
* (cr):Crystalline solid, (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°, -1748.1 kJ · mol−1
- ^ ΔfG°, -1608.2 kJ · mol−1
- ^ S°, 150.50 J · K−1 · mol−1
- ^ Cp°, 135.31 J · K−1 · mol−1
- ^ ΔfH°, -1772.38 kJ · mol−1
- ^ ΔfG°, -1612.98 kJ · mol−1
- ^ S°, 84.5 J · K−1 · mol−1
- ^ ΔfH°, -2346.0 kJ · mol−1
- ^ ΔfG°, -2088.5 kJ · mol−1
- ^ S°, 221.3 J · K−1 · mol−1
- ^ ΔfH°, -3821.7 kJ · mol−1
- ^ ΔfG°, -3279.8 kJ · mol−1
- ^ S°, 434.59 J · K−1 · mol−1
- ^ ΔfH°, -5297.8 kJ · mol−1
- ^ ΔfG°, -4467.8 kJ · mol−1
- ^ S°, 633.83 J · K−1 · mol−1
- ^ ΔfH°, -46.11 kJ · mol−1
- ^ ΔfG°, -16.45 kJ · mol−1
- ^ S°, 192.45 J · K−1 · mol−1
- ^ Cp°, 35.06 J · K−1 · mol−1
- ^ ΔfH°, -80.29 kJ · mol−1
- ^ ΔfG°, -26.50 kJ · mol−1
- ^ S°, 111.3 J · K−1 · mol−1
- ^ ΔfH°, -1917.40 kJ · mol−1
- ^ ΔfG°, -1788.80 kJ · mol−1
- ^ S°, 173.80 J · K−1 · mol−1
- ^ Cp°, 153.47 J · K−1 · mol−1
- ^ ΔfH°, -1997.9 kJ · mol−1
- ^ ΔfG°, -1804.5 kJ · mol−1
- ^ S°, -43.3 J · K−1 · mol−1
- ^ ΔfH°, -1671.9 kJ · mol−1
- ^ ΔfH°, -1674.9 kJ · mol−1
- ^ ΔfG°, -1256.6 kJ · mol−1
- ^ S°, 117. J · K−1 · mol−1
- ^ ΔfH°, -2555.6 kJ · mol−1