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3NaClO + 4H3BO3 ๐Ÿ”ฅโ†’ NaClO2 + Na2B4O7 + Cl2โ†‘ + 6H2O

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Reaction of sodium hypochlorite and boric acid
3NaClOSodium hypochlorite + 4H3BO3Boric acid
๐Ÿ”ฅ
โŸถ
NaClO2Sodium chlorite + Na2B4O7Sodium tetraborate + Cl2โ†‘Chlorine + 6H2OWater

The reaction of sodium hypochlorite and boric acid yields sodium chlorite, sodium tetraborate, chlorine, and water (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

Reaction of sodium hypochlorite and boric acid
3NaClOSodium hypochlorite + 4H3BO3Boric acid
๐Ÿ”ฅ
โŸถ
NaClO2Sodium chlorite + Na2B4O7Sodium tetraborate + Cl2โ†‘Chlorine + 6H2OWater

General equation

Reaction of self redoxing species and acid
Self-redoxing speciesSelf redox agent + AcidNon-redox agent
โŸถ
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of sodium hypochlorite and boric acid

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaClOSodium hypochlorite3
โ€“
Self redoxing
H3BO3Boric acid4
โ€“
Acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaClO2Sodium chlorite1
Oxidized
โ€“
Na2B4O7Sodium tetraborate1
โ€“
โ€“
Cl2Chlorine1
Reduced
โ€“
H2OWater6
โ€“
โ€“

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of sodium hypochlorite and boric acid
โ—†
ฮ”rGโˆ’25.1 kJ/mol
K2.50 ร— 104
pKโˆ’4.40
3NaClOIonized aqueous solution + 4H3BO3Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
NaClO2Ionized aqueous solution + Na2B4O7Ionized aqueous solution + Cl2โ†‘Gas + 6H2OLiquid
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โˆ’25.1โ€“โ€“
โ€“โˆ’8.37โ€“โ€“
per 1 mol of
โ€“โˆ’6.28โ€“โ€“
per 1 mol of
โ€“โˆ’25.1โ€“โ€“
per 1 mol of
โ€“โˆ’25.1โ€“โ€“
per 1 mol of
โ€“โˆ’25.1โ€“โ€“
per 1 mol of
โ€“โˆ’4.18โ€“โ€“

Changes in aqueous solution (2)

Reaction of sodium hypochlorite and boric acid
โ—†
ฮ”rGโˆ’18.1 kJ/mol
K1.48 ร— 103
pKโˆ’3.17
3NaClOIonized aqueous solution + 4H3BO3Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
NaClO2Ionized aqueous solution + Na2B4O7Ionized aqueous solution + Cl2โ†‘Un-ionized aqueous solution + 6H2OLiquid
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โˆ’18.1โ€“โ€“
โ€“โˆ’6.03โ€“โ€“
per 1 mol of
โ€“โˆ’4.53โ€“โ€“
per 1 mol of
โ€“โˆ’18.1โ€“โ€“
per 1 mol of
โ€“โˆ’18.1โ€“โ€“
per 1 mol of
โ€“โˆ’18.1โ€“โ€“
per 1 mol of
โ€“โˆ’3.02โ€“โ€“

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
NaClO (ai)-347.3[1]-298.7[1]100[1]โ€“
H3BO3 (cr)-1094.33[1]-968.92[1]88.83[1]81.38[1]
H3BO3 (g)-994.1[1]โ€“โ€“โ€“
H3BO3 (ao)-1072.32[1]-968.75[1]162.3[1]โ€“
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (g):Gas, (ao):Un-ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
NaClO2 (cr)-307.02[1]โ€“โ€“โ€“
NaClO2 (ai)-306.7[1]-244.7[1]160.2[1]โ€“
NaClO2 (cr)
3 hydrate
-1192.77[1]โ€“โ€“โ€“
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]โ€“
Na2B4O7 (ai)โ€“-3128.7[1]โ€“โ€“
Na2B4O7 (cr)
4 hydrate
-4507.4[1]โ€“โ€“โ€“
Na2B4O7 (cr)
5 hydrate
-4802.4[1]โ€“โ€“โ€“
Na2B4O7 (cr)
10 hydrate
-6288.6[1]-5516.0[1]586[1]615[1]
Cl2 (g)0[1]0[1]223.066[1]33.907[1]
Cl2 (ao)-23.4[1]6.94[1]121[1]โ€“
H2O (cr)โ€“โ€“โ€“โ€“
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, (ai):Ionized aqueous solution, (am):Amorphous solid, (g):Gas, (ao):Un-ionized aqueous solution, (l):Liquid

References

List of references

  1. 1
    Janiel J. Reed (1989)
    The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
    National Institute of Standards and Technology (NIST)