popo_mani Posted October 2, 2005 Posted October 2, 2005 why solid ammonium iron(II) sulphate dissolve in dil.sulphuric acid but not in water??
popo_mani Posted October 2, 2005 Author Posted October 2, 2005 P.S. what are the function of dil.sulphuric acid
woelen Posted October 2, 2005 Posted October 2, 2005 You are wrong. It does dissolve in water quite well.
popo_mani Posted October 2, 2005 Author Posted October 2, 2005 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??
woelen Posted October 2, 2005 Posted October 2, 2005 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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