Transition Elements

Question 1

What precipitate is soluble in excess NaOH + what colour solution does it form

Answer 1

Cr(OH)3 + 3OH- ——> [(Cr(OH)6] 3- grey green - —>dark green solution

Question 2

what colour is Fe2+ and Fe(OH)2+ ?

Answer 2

Fe2+ = pale green
Fe(OH)2 = green ppt

Question 3

what colour is Fe3+ and Fe(OH)3

Answer 3

Fe3+ = yellow
Fe(OH)3 = rusty - brown

Question 4

what colour is Cu2+ and Cu(OH)2 ?

Answer 4

Cu2+ = pale blue
Cu(OH)2 = blue ppt

Question 5

Mn2+ and Mn(OH)2 colours

Answer 5

mn2+ = pale pink
Mn(OH)2 = light brown

Question 6

cu(h20)6 2+ + 4NH3

Answer 6

Cu(NH3)4(H20)2 2+ + 4H20

Question 7

what is a transition element ?

Answer 7

a d-block element that forms at least one ion with an incomplete d-subshell

Question 8

what is a ligand ?

Answer 8

a molecule or ion that donates a pair of e- to the central metal ion to form a co-ordinate bond