Iron(III) sulfate
| Names | |
|---|---|
| IUPAC name
Iron(III) sulfate
| |
| Other names
Ferric sulfate
Sulfuric acid, iron(3+) salt (3:2) | |
| Properties | |
| Fe2(SO4)3 | |
| Molar mass | 399.88 g/mol (anhydrous) 489.96 g/mol (pentahydrate) 562.00 g/mol (nonahydrate) |
| Appearance | Gray-white solid |
| Odor | Odorless |
| Density | 3.097 g/cm3 (anhydrous) 1.898 g/cm3 (pentahydrate) |
| Melting point | 480 °C (896 °F; 753 K) (anhydrous) 175 °C (347 °F) (nonahydrate) |
| Boiling point | Decomposes |
| Slightly soluble | |
| Solubility | Sparingly soluble in alcohol Negligible in acetone, ethyl acetate Insoluble in sulfuric acid, ammonia |
| Hazards | |
| Safety data sheet | Sigma-Aldrich (hydrated) |
| Flash point | Non-flammable |
| Related compounds | |
| Related compounds
|
Iron(II) sulfate |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Iron(III) sulfate also known as ferric sulfate or vitriol of Mars/vitriol martial, is the chemical compound with the formula Fe2(SO4)3, an iron salt.
Contents
Properties
Chemical
Ferric sulfate is used in industry as a coagulant for waste.
Addition of a base, like sodium hydroxide to an aqueous solution of ferric sulfate will precipitate iron(III) hydroxide.
Physical
Ferric sulfate is a yellow, hygroscopic compound. It is soluble in water, poorly soluble in organic solvents such as acetone, ethanol or various acetates. It is insoluble in sulfuric acid. The anhydrous form melts at 480 °C.
Availability
Iron(III) sulfate is available from many chemical suppliers.
One such seller on Amazon sells 4.5 kg of ferric sulfate at 18.40 $.
Preparation
Iron(III) sulfate can be made by reacting sulfuric acid, with a hot solution of ferrous sulfate, and an oxidizing agent, such as hydrogen peroxide.
- 2 FeSO4 + H2SO4 + H2O2 → Fe2(SO4)3 + 2H2O
This method is similar to the one used for obtaining ferric chloride.
n.b. Hydrogen peroxide is also a reducing agent and will reduce Iron(III) to to Iron(II).
Projects
- Make Fenton's reagent
- Coagulant for waste water
Handling
Safety
Ferric sulfate both solid and as solution is corrosive to tissue and metallic objects.
Storage
Ferric sulfate should be stored in a tightly closed container, in a cool, dry place.
Disposal
Ferric sulfate can be neutralized with slaked lime.
