Vanadian chemistry

Question 1

What is vanadium?

Answer 1

= wide range of oxidation states and colours

Question 2

What is the oxidation state odf V+2?

Answer 2

= +2
= violet

Question 3

What is oxidation state and colour of V3+?

Answer 3

= +3 green

Question 4

What is the oxidation state and colour of VO2+?

Answer 4

= +4 blue

Question 5

What is oxidation state and colour of VO2+

Answer 5

= +5 yellow

Question 6

How can vanadium be reduced?

Answer 6

= VO2+ ions can be reduced using zinc in acidic solution, all the way to V2+ ions

Question 7

What is the first step?

Answer 7

= VO2 + is reduced to VO2+- this is a colour change of yellow to blue
= the zinc goes from Zn to Zn2+

Question 8

What is the second step?

Answer 8

= VO2+ is reduced to V3+ and there is a colour change of blue to green
= once again Zn goes to Zn2+

Question 9

What is the final step?

Answer 9

= V3+ is reduced to V2+ colour change of green to violet

Question 10

What are the trends in oxidation state for transition metals?

Answer 10

= compounds with higher oxidation states tend to be oxidisng agents

Question 11

What are the trends in reducing agent for transition metals?

Answer 11

= low oxidation states are more likley to be reducing agents