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EC number: 231-843-4
CAS number: 7758-94-3
Initially very soluble (>>10 g/L), rapid transformation/speciation in environmental waters and body fluidsInitial solubility of the anhydrous form 650 g/L
Testing for this endpoint has been waived in accordance with column 2
restrictions. All soluble iron salts dissociate in aqueous media to the
respective anions and kations, and are then subject to further change of
oxidation and speciated state according to the conditions. Thus the
salts are not stable and undergo fast hydrolysis (DT50 < 12 h) in water,
particularly if oxygen is present and the pH is in the common
environmental ranges. Nonetheless a number of generally high initial
water solubilities are published, which are reported in the following
paragraphs. Comparably aqueous solutions are initially (i.e. before
transformation/speciation) unlimitedly miscible with water and water
solubility is not a relevant endpoint for them, as they are unlimitedly
miscible with water.
Ferrous chloride (FeCl2)
The anhydrous salt and hydrated forms have high initial solubility in
water of 650 g/L (Lide 2002), which is characterized as “freely soluble
in water” in another source (O’Neil et al 2006, The Merck Index).
Solid hydrate form
Ferrous chloride, FeCl2
650 at 25°C
The following Table below shows the maximum dissolved concentration of
the iron kations in pure water as it depends upon pH (see section on
Ferrous iron (II)
Ferric iron (III)
In conclusion the limit of the ferric iron kation solubility is even at
significantly acidified conditions is of the order of ng Fe(III)/L.
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