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7NaClO + 3H4SiO4 → NaClO4 + 3Na2SiO3 + 3Cl2↑ + 6H2O

The reaction of sodium hypochlorite and silicic acid yields sodium perchlorate, sodium metasilicate, 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

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 silicic acid

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaClOSodium hypochlorite7
Self redoxing
H4SiO4Silicic acid3
Acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaClO4Sodium perchlorate1
Oxidized
Na2SiO3Sodium metasilicate3
Cl2Chlorine3
Reduced
H2OWater6

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium hypochlorite and silicic acid
7NaClOIonized aqueous solution + 3H4SiO4Un-ionized aqueous solution
NaClO4Ionized aqueous solution + 3Na2SiO3Aqueous solution + 3Cl2Gas + 6H2OLiquid
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
−6.1
−0.87
per 1 mol of
Silicic acid
−2.0
per 1 mol of
−6.1
−2.0
per 1 mol of
−2.0
per 1 mol of
−1.0

Changes in standard condition (2)

Reaction of sodium hypochlorite and silicic acid
7NaClOIonized aqueous solution + 3H4SiO4Un-ionized aqueous solution
NaClO4Ionized aqueous solution + 3Na2SiO3Aqueous solution + 3Cl2Un-ionized aqueous solution + 6H2OLiquid
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
−76.3
−10.9
per 1 mol of
Silicic acid
−25.4
per 1 mol of
−76.3
−25.4
per 1 mol of
−25.4
per 1 mol of
−12.7

Thermodynamic data of reactants

Chemical formulaStandard 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]
H4SiO4 (cr)-1481.1[1]-1332.9[1]192[1]
H4SiO4 (ao)-1468.6[1]-1316.6[1]180[1]
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (ao):Un-ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard 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
NaClO4 (cr)-383.30[1]-254.85[1]142.3[1]
NaClO4 (ai)-369.45[1]-270.41[1]241.0[1]
NaClO4 (cr)
1 hydrate
-677.77[1]-494.29[1]190.8[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]
Cl2 (g)0[1]0[1]223.066[1]33.907[1]
Cl2 (ao)-23.4[1]6.94[1]121[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, (ai):Ionized aqueous solution, (vit):Vitreous liquid, (aq):Aqueous solution, (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)