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Iron(III) sulfate

Chemical structure of iron(III) sulfate

Iron(III) sulfate is an inorganic compound with formula Fe2(SO4)3.

Table of contents
  1. 1Names
  2. 2Formulae and structures
  3. 3Properties
  4. 4Constituents
  5. 5Thermodynamic properties
  6. 6Solubility
  7. 7Preparations
  8. 8Chemical reactions
  9. 9References
  10. 10Related substances
  11. 11Related categories

Names

List of substance names

Nomenclature
Name
Typical name
Iron(III) sulfate
Compositional nomenclature
Iron(III) sulfate
Additive nomenclature
Iron(3+) tetraoxidosulfate(2−)
Other names
Ferric sulfate

Formulae and structures

List of formulae

Formula name
Formula
Typical formula
Fe2(SO4)3
Compositional formula
Fe2(SO4)3
Structural formula
Chemical structure of iron(III) sulfate
Other structural formulas
Chemical structure of iron(III) sulfate with double bonds
Lewis structure
Lewis structure of iron(III) sulfate
Colored Lewis structure
Colored Lewis structure of iron(III) sulfate

Properties

List of substance properties

Item
Value
Name
Iron(III) sulfate
Formula
Fe2(SO4)3
Appearance
Grayish white solid
Odor
Odorless
Molar mass
399.86 g/mol
Density
3.097 g/cm3[1]
Solid, 18°C
3.10 g/cm3[2]
Solid
Melting point
1178 °C[1]
Decompose → Fe2O3, SO3
Boiling point

Constituents

Constituent ions

IonNameCharge numberNumber
Fe3+Iron(III) ion32
SO42−Sulfate ion-23

Constituent atoms

AtomNameOxidation stateNumber
FeIron+32
SSulfur+63
OOxygen−212

Ratio of atoms

AtomAtomic weightNumberAtomic ratioWeight ratio
Fe55.845211.76%27.93%
S32.06317.65%24.05%
O15.9991270.59%48.01%
FeSOAtomic ratio
FeSOWeight ratio

Thermodynamic properties

Phase transition properties

Item
Value
Enthalpy of fusion
Enthalpy of vaporization
Enthalpy of vaporization at 25°C
Enthalpy of other transition

Standard thermodynamic properties

State
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
Crystalline solid−2581.5[3]
Ionized aqueous solution−2825.0[3]−2242.8[3]−571.5[3]

Solubility

Qualitative solubility

Reactive
Slowly reactive
Miscible
Very soluble
Soluble
Slightly soluble
Very slightly soluble
Insoluble

Preparations

Reaction of acid and base

The reaction of sulfuric acid and iron(III) hydroxide yields iron(III) sulfate and water.

Reaction of base and acidic oxide

The reaction of iron(III) hydroxide and sulfur trioxide yields iron(III) sulfate and water.

Reaction of basic oxide and acid

The reaction of iron(III) oxide and sulfuric acid yields iron(III) sulfate and water.

Reaction of basic oxide and acidic oxide

The reaction of iron(III) oxide and sulfur trioxide yields iron(III) sulfate.

Reaction of salt of weak acid and strong acid

The reaction of salt of weak acid and strong acid can yield iron(III) sulfate.

Reaction of active metal and acid

The reaction of iron and sulfuric acid yields iron(III) sulfate and hydrogen.

Reaction of iron and sulfuric acid
ΔrG−9.2 kJ/mol
K4.09 × 101
pK−1.61

Reaction of active metal, acidic oxide, and water

The reaction of iron, sulfur trioxide, and water yields iron(III) sulfate and hydrogen.

Reaction of iron, sulfur trioxide, and water
ΔrG−408.8 kJ/mol
K4.16 × 1071
pK−71.62

Decomposition

Decomposition of thermally decomposable substance can yield iron(III) sulfate.

Chemical reactions

Electrolytic dissociation

Electrolytic dissociation of iron(III) sulfate yields iron(III) ion and sulfate ion.

Reaction with strong base

The reaction of iron(III) sulfate and strong base yields salt of strong base and iron(III) hydroxide.

Reaction with dehydrating acid

The reaction of iron(III) sulfate and phosphoric acid yields iron(III) phosphate, sulfur trioxide, and water.

Reaction with reducing species

The reaction of reducing species and iron(III) sulfate yields a variety of products.

Reaction of sodium and iron(III) sulfate
ΔrG−1562.3 kJ/mol
K5.05 × 10273
pK−273.70
Reaction of hydrogen and iron(III) sulfate
ΔrG−813.9 kJ/mol
K3.88 × 10142
pK−142.59
Reaction of sodium and iron(III) sulfate
ΔrG−2262.7 kJ/mol
K2.56 × 10396
pK−396.41

Reaction with oxidizable species under acidic condition

The reaction of oxidizable species, iron(III) sulfate, and hydrogen ion yields a variety of products.

Reaction of copper and iron(III) sulfate under acidic condition
ΔrG−105.6 kJ/mol
K3.16 × 1018
pK−18.50
10CuCopper + Fe2(SO4)3Iron(III) sulfate + 24H+Hydrogen ion
🔥
10Cu2+Copper(II) ion + 2Fe2+Iron(II) ion + 3SSulfur + 12H2OWater
Reaction of copper and iron(III) sulfate under acidic condition
ΔrG−22.7 kJ/mol
K9.48 × 103
pK−3.98
9CuCopper + Fe2(SO4)3Iron(III) sulfate + 24H+Hydrogen ion
🔥
9Cu2+Copper(II) ion + 3SSulfur + 2Fe3+Iron(III) ion + 12H2OWater

Reaction with oxidizable species

The reaction of oxidizable species and iron(III) sulfate yields a variety of products.

Reaction with hardly oxidizable species under acidic condition

The reaction of hardly oxidizable species, iron(III) sulfate, and hydrogen ion yields a variety of products.

Reaction of hydrogen chloride and iron(III) sulfate under acidic condition
ΔrG513.4 kJ/mol
K0.11 × 10−89
pK89.94
2HClHydrogen chloride + Fe2(SO4)3Iron(III) sulfate + 4H+Hydrogen ion
🔥
Cl2Chlorine + 2Fe2+Iron(II) ion + 3SO3Sulfur trioxide + 3H2OWater
Reaction of gold and iron(III) sulfate under acidic condition
2AuGold + 3Fe2(SO4)3Iron(III) sulfate + 18H+Hydrogen ion
🔥
2Au3+Gold(III) ion + 6Fe2+Iron(II) ion + 9SO3Sulfur trioxide + 9H2OWater
Reaction of gold and iron(III) sulfate under acidic condition
2AuGold + Fe2(SO4)3Iron(III) sulfate + 6H+Hydrogen ion
🔥
2Au+Gold(I) ion + 2Fe2+Iron(II) ion + 3SO3Sulfur trioxide + 3H2OWater
Reaction of hydrogen chloride and iron(III) sulfate under acidic condition
ΔrG1099.5 kJ/mol
K0.24 × 10−192
pK192.62
Reaction of sodium chloride and iron(III) sulfate under acidic condition
ΔrG513.4 kJ/mol
K0.11 × 10−89
pK89.94
2NaClSodium chloride + Fe2(SO4)3Iron(III) sulfate + 6H+Hydrogen ion
🔥
2Na+Sodium ion + Cl2Chlorine + 2Fe2+Iron(II) ion + 3SO3Sulfur trioxide + 3H2OWater

Precipitation reaction

When a certain chemical species is present in aqueous solution, it reacts with iron(III) sulfate to form a precipitate.

Decomposition

Decomposition of iron(III) sulfate yields iron(III) oxide and sulfur trioxide.

Decomposition of iron(III) sulfate
ΔrG1342.2 kJ/mol
K0.72 × 10−235
pK235.14

Electrolysis of aqueous solution

Electrolysis of aqueous iron(III) sulfate yields a variety of products.

Electrolysis of water
ΔrG474.258 kJ/mol
K0.82 × 10−83
pK83.09
Electrolysis of aqueous iron(III) sulfate with water as non-redox agent
ΔrG300.5 kJ/mol
K0.23 × 10−52
pK52.65
Electrolysis of aqueous iron(III) sulfate without water as reactant
ΔrG454.0 kJ/mol
K0.29 × 10−79
pK79.54
Electrolysis of aqueous iron(III) sulfate with water as non-redox agent
ΔrG187.6 kJ/mol
K0.14 × 10−32
pK32.87

References

List of references

  1. 1
  2. 2
    John R. Rumble Jr, David R. Lide, Thomas J. Bruno (2019)
    CRC Handbook of Chemistry and Physics 100th Edition
    CRC Press

  3. 3
    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)