We were assigned to prepare a standard Fe for spectrophotometry determination of Fe. What we did is basically obtain a mass of FeSO4•7H2O, add a small a mount of distilled water before adding 18M of H2SO4 then dilute.
My question is what exactly is the purpose of H2SO4? I asked my prof about it and she said it was to prevent Fe2+ from oxidizing. I'm not really satisfied with that answer. Maybe because we did add hydoxylamine hydrochloride later to reduce the Fe3+ present so I don't see the need to do that addition aside from a different purpose. Can anyone provide the redox reaction of it if it really is a redox reaction happening? Thank you so much for any help much appreciated