Ferric Ammonium Sulphate

Ferric Ammonium Sulphate
This ammonium sulphate is is a double salt of iron sulfate and ammonium sulfate. Mohr's salt is preferred over iron(II) sulfate for titration purposes as it is much less affected by oxygen in the air than iron(II) sulfate, solutions of which tend to oxidise to iron(III). The oxidation of solutions of iron(II) is very pH dependent, occurring much more readily at high pH. The ammonium ions make solutions of Mohr's salt slightly acidic, which prevents this oxidation from occurring.H4Fe(SO4)2.12H2OM.W. - 482.19Min. Assay(by iodometry) - 98-101%Maximum limits of Impurities:Chloride(Cl) - 0.002%Lead(Pb) - 0.002%Iron(II)(Fe) - 0.002%Copper(Cu) - 0.002%Zinc(Zn) - 0.005%Substances not precipitableby NH3(as sulphate) - 0.1%
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