17B.5 Flashcards
What is the colour of Vanadium(ii)
purple
what is the colour of Vanadium(III)
Green
what is the colour of Oxovanadium(IV) VO^2+
Blue
what is the colour of dioxovanadium(V) V02^+
Yellow
why is Vanadium a good choice for redox reactions
because all its ions form a distinct colour so it would be easy to see a clear change in the oxidation number by observing the colour change
what is the source of vanadium with an oxidation number of 5+
ammonuim vandate(V) NH4VO3
an acidic solution of Ammonium Vanadate(V) contains
diooxovanaduim(V) ions
how do we reduce Vanaduim from 5+ to 2+
We get the Ammonuin vanadate(v) (NH4VO3) make it into an acidic solution to form Diooxovanaduim(V) ions (V^5+) then add zinc to this solution and see a gradual colour change from yellow to blue to green to purple since it goes from 5+ to 4+ to 3+ to 2+ oxidation number
why is the reduction reaction of V^2+ to V with Zinc thermodynamically infeasible
that is because V^2+ is a better-reducing agent since it has a more negative E value, so no electrons from zinc will be released with respect of V^2+
what are all the redox reactions for Vanadium
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