Transition Metal reactions

Question 1

For Cr3+, what is the colour of the metal aqua colour? and the complex formula?

Answer 1

Violet = [Cr(H2O)6]3+]

Question 2

For Cr3+, what is the colour or change in appearance when OH- is added? and the complex formula?

Answer 2

Violet to grey-green Precipitate

Green Precipitate = Cr(OH)3(H2O)3

Question 3

For Cr3+, what is the colour or change in appearance when Excess OH- is added? and the complex formula?

Answer 3

Green Precipitate to Dark Green Solution.

Green Solution = [Cr(OH6]3-

Question 4

For Fe2+, what is the colour of the metal aqua colour? and the complex formula?

Answer 4

Pale Green Solution = [Fe(H2O)6 ] 2+]

Question 5

For Fe2+, what is the colour or change in appearance when OH- is added? and the complex formula?

Answer 5

Green Precipitate = Fe(OH)2(H2O)4

Question 6

For Fe2+, what is the colour or change in appearance when Excess OH- is added? and the complex formula?

Answer 6

Green Precipitate

No Change = Fe(OH)2(H2O)4

Question 7

For Fe3+, what is the colour of the metal aqua colour? and the complex formula?

Answer 7

Pale Yellow solution = [Fe(H2O)6 ]3+

Question 8

For Fe3+, what is the colour or change in appearance when OH- is added? and the complex formula?

Answer 8

Orange-Brown Precipitate = Fe(OH)3(H2O)3

Question 9

For Fe3+, what is the colour or change in appearance when Excess OH- is added? and the complex formula?

Answer 9

Orange brown precipitate

No Change = Fe(OH)3(H2O)3

Question 10

For Mn2+, what is the colour of the metal aqua colour? and the complex formula?

Answer 10

Pale Pink Solution = [Mn(H2O)6 ]2+

Question 11

For Mn2+, what is the colour or change in appearance when OH- is added? and the complex formula?

Answer 11

Pale Brown Precipitate = Mn(OH)2(H2O)4

Question 12

For Mn2+, what is the colour or change in appearance when Excess OH- is added? and the complex formula?

Answer 12

Pale Brown Precipitate

No Change = Mn(OH)2(H2O)4

Question 13

For Cu2+, what is the colour of the metal aqua colour? and the complex formula?

Answer 13

Blue Solution = [Cu(H2O)6 ]2+

Question 14

For Cu2+, what is the colour or change in appearance when OH- is added? and the complex formula?

Answer 14

Blue Precipitate = Cu(OH)2(H2O)4

Question 15

For Cu2+, what is the colour or change in appearance when Excess OH- is added? and the complex formula?

Answer 15

Blue Precipitate

No Change = Cu(OH)2(H2O)4

Question 16

For Cr3+, what is the colour of the metal aqua colour? and the complex formula?

Answer 16

Violet = [Cr(H2O)6]3+

Question 17

For Cr3+, what is the colour or change in appearance when NH3 is added? and the complex formula?

Answer 17

Grey-Green Precipitate = Cr(OH)3(H2O)3

Question 18

For Cr3+, what is the colour or change in appearance when Excess NH3 is added? and the complex formula?

Answer 18

Purple Solution - [Cr(NH3)6]+3

Question 19

For Fe2+, what is the colour of the metal aqua colour? and the complex formula?

Answer 19

Pale-Green Solution = [Fe(H2O)6 ] 2+

Question 20

For Fe2+, what is the colour or change in appearance when NH3 is added? and the complex formula?

Answer 20

Green Precipitate = Fe(OH)2(H2O)4

Question 21

For Fe2+, what is the colour or change in appearance when Excess NH3 is added? and the complex formula?

Answer 21

Green Precipitate

No Change = Fe(OH)2(H2O)4

Question 22

For Fe3+, what is the colour of the metal aqua colour? and the complex formula?

Answer 22

Pale-Yellow solution = [Fe(H2O)6 ]3+

Question 23

For Fe3+, what is the colour or change in appearance when NH3 is added? and the complex formula?

Answer 23

Orange-Brown Precipitate = Fe(OH)3(H2O)3

Question 24

For Fe3+, what is the colour or change in appearance when Excess NH3 is added? and the complex formula?

Answer 24

Orange-Brown Precipitate

No change= Fe(OH)3(H2O)3

Question 25

For Mn2+, what is the colour of the metal aqua colour? and the complex formula?

Answer 25

Pale Pink Solution = [Mn(H2O)6 ]2+

Question 26

For Mn2+, what is the colour or change in appearance when NH3 is added? and the complex formula?

Answer 26

Pale Brown Precipitate = Mn(OH)2(H2O)4

Question 27

For Mn2+, what is the colour or change in appearance when Excess NH3 is added? and the complex formula?

Answer 27

Pale Brown Precipitate No Change = Mn(OH)2(H2O)4

Question 28

For Cu2+, what is the colour of the metal aqua colour? and the complex formula?

Answer 28

Blue Solution = [Cu(H2O)6 ]2+

Question 29

For Cu2+, what is the colour or change in appearance when NH3 is added? and the complex formula?

Answer 29

Blue Precipitate = Cu(OH)2(H2O)4

Question 30

For Cu2+, what is the colour or change in appearance when Excess NH3 is added? and the complex formula?

Answer 30

Dark Blue Solution = [Cu(NH3)4(H2O)2]2+