transition metals☹️

Question 1

Cr3+ aqueous ion colour and formula

Answer 1

Violet solution

[Cr(H2O)6]3+

Question 2

Fe2+ aqueous colour and formula

Answer 2

Green solution

[Fe(H2O)6]2+

Question 3

Fe3+ aqueous colour and formula

Answer 3

Yellow solution

[Fe(H2O)6]3+

Question 4

Mn2+ aqueous colour and formula

Answer 4

Pale pink solution

[Mn(H2O)6]2+

Question 5

Cu2+ aqueous colour and formula

Answer 5

Blue solution

[Cu(H2O)6]2+

Question 6

Cr3+ and NaOH

colour change and equation

Answer 6

initially
violet solution to green ppt
[Cr(H2O)6]3+ + 3OH- = Cr(OH)3(H2O)3

in excess
violet solution to green solution
[Cr(H2O)6]3+ + 6OH- = [Cr(OH)6]3-

Question 7

Fe2+ and NaOH colour change and equation

Answer 7

green solution to green ppt

[Fe(H2O)6]2+ + 2OH- -> Fe(OH)2(H2O)4

Question 8

Fe3+ and NaOH colour change and equation

Answer 8

yellow solution to brown ppt

[Fe(H2O)6]3+ +OH- -> Fe(OH)3(H2O)3

Question 9

Mn2+ and NaOH colour change and equation

Answer 9

pale pink solution to pale brown ppt

[Mn(H2O)6]2+ + OH- -> Mn(OH)2(H2O)4

Question 10

Cu2+ and NaOH colour change and equation

Answer 10

blue solution to blue ppt

[Cu(H2O)6]2+ + OH- -> Cu(OH)2(H2O)4

Question 11

Cr3+ and NH3 colour change and equation

Answer 11

initially
violet solution to green ppt
[Cr(H2O)6]3+ +NH3 -> Cr(OH)3(H2O)3 + NH4+

in excess
to purple solution
[Cr(NH3)6]3+

Question 12

Fe2+ and NH3 colour change and equation

Answer 12

green solution to green ppt

[Fe(H2O)6]2+ + NH3 -> Fe(OH)2(H2O)4 + NH4+

Question 13

Fe3+ and NH3 colour change and equation

Answer 13

yellow solution to brown ppt

[Fe(H2O)6]3+ + NH3 -> Fe(OH)3(H2O)3

Question 14

Mn2+ and NH3 colour change and equation

Answer 14

pale pink ppt to pale brown ppt

[Mn(H2O)6]2+ + NH3 -> Mn(OH)2(H2O)4

Question 15

Cu2+ and NH3 colour change and equation

Answer 15

initially
blue solution to blue ppt

[Cu(H2O)6]2+ +NH3 -> Cu(OH)2(H2O)4

in excess
deep blue solution
[Cu(NH3)4(H2O)2]2+

Question 16

Cu2+ and chlorine colour change and equation

Answer 16

[Cu(H2O)6]2+ + 4Cl- -> [CuCl4]2- +6H2O

blue solution to yellow solution

Question 17

what is a transition metal

Answer 17

has at least one ion with partially filled d orbital

Question 18

three types of reactions of transition metals

Answer 18

ppt, ligand sub, redox