acx01b - 1-12-2005 at 04:57
first dissolved 0.05g Kmno4 in 10ml water (purple color), then added 0.5ml (excess) isopropylamine, color became blue-green (nearly same color as
kmno4 + Naoh, but more blue, less green) then solution became quite clear.... and finally added 8ml 35% H2SO4 (excess) and solution became 100%
orange....
but no Mn compounds precipitated...
so what happened ? is it Mn2+ compound that give orange color ? ty for help
can isopropylamine be oxided by kmno4 ???
chemoleo - 1-12-2005 at 09:25
Were you trying to make 2-nitropropane?
In that case, I'd also check the nitroalkane, and nitroethanol threads, there's some info on KMnO4 oxidation. I don't think it's a
well-studied method.
Anyway.... I should think the orange colour is a result of polymerisation products of isopropylamine, and oxidised/condensed variations, similar to
acetone acquiring a dark colour in the presence of H2SO4.
No, Mn2+ is weakly pink, not orange.
Your excess vs KMnO4 are quite big, why?
acx01b - 1-12-2005 at 09:28
was just trying to see if isopropylamine could make kmno4 reacting
ok ty
i got complete decoloration of kmno4 solution by mixing with excess H2SO4 and isopropylamine, that would mean isopropylamine is oxyded, but in what
???
Nicodem - 1-12-2005 at 10:21
to acetone of course