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FeSiO3 + 2KOH → K2SiO3 + Fe(OH)2

The reaction of iron(II) metasilicate and potassium hydroxide yields potassium metasilicate and iron(II) hydroxide. This reaction is an acid-base reaction and is classified as follows:

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

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
FeSiO3Iron(II) metasilicate1
Brønsted acid
Salt of weak base
KOHPotassium hydroxide2
Brønsted base
Strong base

Products

Chemical formulaNameCoefficientTypeType in general
equation
K2SiO3Potassium metasilicate1
Conjugate acid
Salt of strong base
Fe(OH)2Iron(II) hydroxide1
Conjugate base
Weak base

Thermodynamic changes

Changes in standard condition

Reaction of iron(II) metasilicate and potassium hydroxide
FeSiO3Crystalline solid + 2KOHCrystalline solid
K2SiO3Crystalline solid + Fe(OH)2Crystalline solidprecipitated
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
per 1 mol of

Changes in aqueous solution

Reaction of iron(II) metasilicate and potassium hydroxide
FeSiO3Crystalline solid + 2KOHIonized aqueous solution
K2SiO3Crystalline solid + Fe(OH)2Crystalline solidprecipitated
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
per 1 mol of

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
FeSiO3 (cr)-1205[1]
KOH (cr)-424.764[1]-379.08[1]78.9[1]64.9[1]
KOH (g)-231.0[1]-232.6[1]238.3[1]49.20[1]
KOH (ai)-482.37[1]-440.50[1]91.6[1]-126.8[1]
KOH (cr)
1 hydrate
-748.9[1]-645.1[1]117.2[1]
KOH (cr)
2 hydrate
-1051.0[1]-887.3[1]150.6[1]
* (cr):Crystalline solid, (g):Gas, (ai):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
K2SiO3 (cr)146.0[1]118.4[1]
Fe(OH)2 (cr)
precipitated
-569.0[1]-486.5[1]88[1]
Fe(OH)2 (g)-372[1]
* (cr):Crystalline solid, (g):Gas

References

List of references

  1. 1