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About dissolve ammonium iron(II) sulphate

popo_mani
in Inorganic Chemistry

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why solid ammonium iron(II) sulphate dissolve in dil.sulphuric acid but not in water??

You are wrong. It does dissolve in water quite well.

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but my teacher give that chemistry menu to me...

the solid ammonium iron(II) sulphate first dissolve in dil.sulphuric acid , and then water...

how come??

but my teacher give that chemistry menu to me...

the solid ammonium iron(II) sulphate first dissolve in dil.sulphuric acid ' date=' and then water...

how come??[/quote']

The solubility cannot be the reason of this. I have this stuff and it dissolves in water quite well and easily.

 

The reason he wants you to dissolve it in dil. H2SO4 first may be that it is somewhat prone to aerial oxidation. The sensitivity depends on pH. The ferrous ion, Fe(2+) is sensitive to aerial oxidation, but only at high pH. The salt ferrous ammonium sulfate is somewhat acidic on its own, because of the ammonium, so it hardly is oxidized and I personally think it is not necessary to dissolve it in dilute acid. With plain ferrous sulfate, this effect is much stronger and yes, if you do not want much ferric ion in your solution, then you have to dissolve that in dilute acid.

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