Lol thanks for that so confused with it all, have you not got any idea?
Thanks
Claire
Yes. Yes I do. I'd done it, often enough, in US high school classes, university classes, and in industry. But I can't give you all the answers, because that would be cheating, and the UK is pissed off enough at the US with Dubya's war, and would likely turn their nukes loose on us if I gave it all away. Furthermore, you might or might not be able to tell, but asking me for "everything", is like asking 50 questions at once, and I don't have time for that. Try a textbook, you'll see many of the steps, and some of the reasons why we do things a certain way. That way you can write a good convincing explanation for your decisions. And from there, we can help you a little bit, with some of the smaller (not simpler) problems you're having.
I worry a little bit about your spectrophotometric measurement of Fe(OH)2, however. What you're doing is a turbidity analysis -- measuring how light is scattered by an insoluble component in solution, and that for one thing doesn't necessarily follow Beer's law. Furthermore, you'll have to take into account how the solid forms, to get uniform particles forming from sample to sample, and then there's the issue of settling, and how much time the sample sits out. Look up turbidity, it is not a simple procedure.