4NaClO + 4H3BO3 🔥→ 2NaCl + Na2B4O7 + 2HClO2 + 5H2O
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- Reaction of sodium hypochlorite and boric acid
The reaction of sodium hypochlorite and boric acid yields sodium chloride, sodium tetraborate, chlorous acid, and water (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of sodium hypochlorite and boric acid
General equation
- Reaction of self redoxing species and acid
- Self-redoxing speciesSelf redox agent + AcidNon-redox agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of sodium hypochlorite and boric acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| NaClO | Sodium hypochlorite | 4 | – | Self redoxing |
| H3BO3 | Boric acid | 4 | – | Acid |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| NaCl | Sodium chloride | 2 | Reduced | – |
| Na2B4O7 | Sodium tetraborate | 1 | – | – |
| HClO2 | Chlorous acid | 2 | Oxidized | – |
| H2O | Water | 5 | – | – |
Thermodynamic changes
Changes in aqueous solution
- Reaction of sodium hypochlorite and boric acid◆
ΔrG −19.0 kJ/mol K 2.13 × 103 pK −3.33
| 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 | – | −19.0 | – | – |
per 1 mol of | – | −4.75 | – | – |
per 1 mol of | – | −4.75 | – | – |
per 1 mol of | – | −9.50 | – | – |
per 1 mol of | – | −19.0 | – | – |
per 1 mol of | – | −9.50 | – | – |
per 1 mol of | – | −3.80 | – | – |
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 |
|---|---|---|---|---|
| NaClO (ai) | -347.3[1] | -298.7[1] | 100[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] | – |
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (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 |
|---|---|---|---|---|
| NaCl (cr) | -411.153[1] | -384.138[1] | 72.13[1] | 50.50[1] |
| NaCl (g) | -176.65[1] | -196.66[1] | 229.81[1] | 35.77[1] |
| NaCl (ai) | -407.27[1] | -393.133[1] | 115.5[1] | -90.0[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] |
| HClO2 (ao) | -51.9[1] | 5.9[1] | 188.3[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, (g):Gas, (ai):Ionized aqueous solution, (am):Amorphous solid, (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°, -347.3 kJ · mol−1
- ^ ΔfG°, -298.7 kJ · mol−1
- ^ S°, 100. 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°, -411.153 kJ · mol−1
- ^ ΔfG°, -384.138 kJ · mol−1
- ^ S°, 72.13 J · K−1 · mol−1
- ^ Cp°, 50.50 J · K−1 · mol−1
- ^ ΔfH°, -176.65 kJ · mol−1
- ^ ΔfG°, -196.66 kJ · mol−1
- ^ S°, 229.81 J · K−1 · mol−1
- ^ Cp°, 35.77 J · K−1 · mol−1
- ^ ΔfH°, -407.27 kJ · mol−1
- ^ ΔfG°, -393.133 kJ · mol−1
- ^ S°, 115.5 J · K−1 · mol−1
- ^ Cp°, -90.0 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°, -51.9 kJ · mol−1
- ^ ΔfG°, 5.9 kJ · mol−1
- ^ S°, 188.3 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