Water treatment and disinfection
Ferrous sulfate vs ferric chloride
Ferrous sulfate (FeO4S, CAS 7720-78-7) and ferric chloride (Cl3Fe, CAS 7705-08-0) are both listed under skin conditioning agents and actives.
Ferrous sulfate has a molar mass of 151.91 g/mol, ferric chloride 162.20 g/mol.
Ferrous sulfate carries the GHS signal word Warning, ferric chloride Danger.
On CompoundList, 436 suppliers list ferrous sulfate and 386 suppliers list ferric chloride.
Data last updated 7 October 2026
 |  | |
|---|---|---|
| Identity | ||
| Name in our database | Ferrous sulfate | Iron chloride (FeCl3) |
| CAS number | 7720-78-7 | 7705-08-0 |
| Molecular formula | FeO4S | Cl3Fe |
| Molar mass | 151.91 g/mol | 162.20 g/mol |
| IUPAC name | iron(2+) sulfate | trichloroiron |
| EC number | 231-753-5 | 231-729-4 |
| Physical properties | ||
| Appearance | White orthorhombic crystals, hygroscopic | Hexagonal red by transmitted light, green by reflected light, sometimes appears brownish-black, dark leaflets or plates |
| Melting point | Not recorded | 304 °C |
| Boiling point | Not recorded | Ca. 316 |
| Density | 3.56 g/cm³ | 2.9 g/cm³ |
| Solubility | White to yellow crystalline powder. Sol in water. Loses water @ about 300 °C, decomp @ higher temp. /Ferrous sulfate monohydrate/ | In cold water: 74.4 g/100 cc at 0 °C, in hot water: 535.7 g/100 cc at 100 °C, in acetone: 63 g/100 cc at 18 °C, very sol in alc, ether, methanol. |
| LogP (octanol/water)Computed from the structure | -1.34 | 2.07 |
| Safety (GHS) | ||
| Signal word | Warning | Danger |
| Pictograms | ||
| Hazard statements |
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| UN number | Not recorded | UN 1773 |
| Uses and classification | ||
| Uses and functions |
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| Category | Inorganic chemicals › Sulfates and sulfur salts | Inorganic chemicals › Chlorides and other halides |
| HS code | 283329Sulphates, alums, peroxosulphates (persulphates), other | 282739Chlorides, chloride oxides and chloride hydroxides, bromides and bromide oxides, iodides… |
| Market on CompoundList | ||
| Suppliers | 436 suppliers | 386 suppliers |
| Supplier countries | 53 countries, most in India, China, United States | 51 countries, most in India, United States, China |
| Price rangeOnly prices set by suppliers who manage their own profile | Price on request | Price on request |
Measured and computed values as shown on each chemical page, plus live listings on CompoundList. Details may have changed, please confirm them with the supplier. Safety data is a summary, not an SDS.
Ferrous sulfate
Ferric chloride
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