Registration Dossier
Registration Dossier
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EC number: 231-729-4 | CAS number: 7705-08-0
Boiling point
Administrative data
Link to relevant study record(s)
Description of key information
FeCl3 decomposes without boiling at 315 ºC; Hexahydrate boils/decomposes at ca. 285 ºC; Aqueous solution boils at 106-120 ºC
Key value for chemical safety assessment
Additional information
Testing for this endpoint has been waived in accordance with column 2 restrictions.
Aqueous solutions
The boiling point of watery iron salt solutions can be approximated based on the molarity by:
delta T(boiling) = bs∙Ke,
where delta T(boiling) is the boiling point elevation [K], Ke is the ebullioscopic constant for water (= 0.521 K∙kg/mol) and bs is the combined molarity of the salts [mol/kg].
The likely boiling point ranges from ca. 106 to 120 °C at 101325 Pa.
“Sublimation”
The anhydrous ferric chloride (FeCl3) salt undergoes decomposition just above its melting point. This has meant that the melting of ferric chloride has been reported by some editors as sublimation. It can be expected that the substance will decompose completely without boiling.
Table: Boiling points under standard pressure (ISO 5011, i.e. 101.3 kPa)
| Category member, Molecular Formula | Anhydrous form | Solid hydrate form | Aqueous solution |
| Ferric chloride, FeCl3 | 315-332 °C (decomposes) | Hexahydrate CAS 10025-77-1: 280 - 285 °C (decomposes) | 106-120 °C |
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