YOUCHEMISTRY: COLOURFULL OXIDATION STATES OF VANADIUM

16 Apr 2011

COLOURFULL OXIDATION STATES OF VANADIUM

Sodium Vanadate (NaVO3) is dissolved in diluted HCl giving a solution containing (VO2)Cl through a dehydration (acid-base) reaction that also releases 2H2O and NaCl (I made this up but I guess it is what actually happens):

NaVO3 + 2 HCl = NaCl + H2O + (VO2)Cl

(VO2)Cl in solution gives YELLOW VO2+ cations (Vanadium +5) which can be sequentially reduced (Zn-Hg amalgam) to BLUE VO2+ (Vanadium +4), to GREEN V+3 and finally to LAVANDER V+2.

Posted by Lobo Veloz at 11:08
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1 comment:

  1. yuvaraj25 September 2012 at 18:03

    Zn-Hg only used to reduce the vanadium oxidation states. what about Ascorpic acid and benzyl alcohol? these two are also a reducing agent..

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