Oxidation of Vanadium    

SS5.1 Investigating the oxidation states of Vanadium

Ammonium vanadate dissolves in moderately concentrated acid to give a yellow solution, the ion present being of oxidation state +5. Granuled zinc is added to act as a reducing agent and the oxidation state of the vanadium changes from +5 to +4 to +3 to +2 with the corresponding colour changes from yellow to blue to green to violet.

This video demonstrates the coloured nature of transition metals in addition to demonstrating that the actual colour depends on the oxidation state.

Left click to see high quality video clip, right click to download (6.5MB)

Right click and open a new window to view a Powerpoint summary slide with photographs of each oxidation state

For further information see Salters Advanced Chemistry, 2000, Activities and Assessment Pack, Second Edition, ISBN 0 435 631217