Quote: Originally posted by AJKOER | I suspect that you have formed a double salt with Iron & Ammonia (Ferrous Ammonium Chloride is a candidate, for example). Other combinations with
ammonia I quess are also possible. The good news is that these salts are distinctly colored. So use this in identifying your salt.
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And I suspect you’re wrong.
Firstly, he mentions a slurry: that implies precipitation. Most ferrous double salts are highly soluble.
Secondly, most ferrous double salts are light coloured. If you have examples of deeply coloured ones, please provide references.
Unfortunately Antiswat provided precious little information re. the actual conditions but assuming the iron was ferrous, fairly concentrated and there
was enough ammonia to neutralise the excess acid, then a precipitate of Fe(OH)2.nH2O is the most likely cause of the slurry. Also, if through air
oxidation there was also some Fe (III) present, then dark coloured magnetite (Fe3O4) could have formed.
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