Transition Metals: ion colours

Question 1

What is the colour of hexa-aqua copper 2+?

Answer 1

blue solution

Question 2

What is the colour of hexa-aqua iron 2+?

Answer 2

green solution

Question 3

What is the colour of hexa-aqua aluminium 3+?

Answer 3

colourless solution

Question 4

What is the colour of hexa-aqua iron 3+ ?

Answer 4

yellow solution

Question 5

What is the compound formed when hexa-aqua copper 2+ reacts with OH⁻ or NH₃?
And colour?

Answer 5

Cu(OH)₂(H₂O)₄
blue precipitate

Question 6

What is the compound formed when hexa-aqua iron 2+ reacts with OH⁻ or NH₃?
And colour?

Answer 6

Fe(OH)₂(H₂O)₄
green precipitate (goes brown on standing in air)

Question 7

What is the compound formed when hexa-aqua aluminium 3+ reacts with OH⁻ or NH₃?
And colour?

Answer 7

Al(OH)₃(H₂O)₃
white precipitate

Question 8

What is the compound formed when hexa-aqua iron 3+ reacts with OH⁻ or NH₃?
And colour?

Answer 8

Fe(OH)₃(H₂O)₃
brown precipitate