What are differences between Mohr's salt, and green vitriol?

1 Answer
anor277
Apr 19, 2017

Well, green vitriol is Fe(SO)4, an iron(II) salt.........

Explanation:

And Mohr's salt is (NH4)2[Fe(SO4)2]⋅6H2O.

And so in the solid state, they are different formulations.......and have different coordination geometry.

In solution, however, for both species, we LIKELY have [Fe(OH2)6]2+ as the dominant iron species in solution. The sulfate and ammonium counterions are along for the ride. There is possibly some literature on this, which is likely informed by UV-vis spectrometry.

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