Transition Metal Ions

Question 1

What is the colour change for the reaction of [Cr(H20)6]3+ with dropwise OH- ions? What is the complex formed?

Answer 1

Colour Change: Violet -> Green Precipitate
Complex formed: Cr(OH)3(H2O)3

Question 2

What is the colour change for the reaction of [Cr(H20)6]3+ with excess OH- ions?
What is the complex formed?

Answer 2

Colour Change: Violet -> Green Solution
Complex formed: [Cr(OH)6]3-

Question 3

What is the colour change for the reaction of [Cr(H20)6]3+ with dropwise NH3? What is the complex formed?

Answer 3

Colour Change: Violet Solution -> Green Precipitate
Complex formed:
[Cr(OH)3(H2O)3]3+

Question 4

What is the colour change for the reaction of [Cr(H20)6]3+ with excess NH3? What is the complex formed?

Answer 4

Colour Change: Violet Solution -> Purple Solution
Complex formed: [Cr(NH3)6]3+

Question 5

What is the colour change for the reaction of [Fe(H2O)]2+ with dropwise OH- ions?
What is the complex formed?
What is the reaction with excess OH- ions?

Answer 5

Colour Change: Green Solution -> Green Precipitate
Complex Formed: [Fe(OH)2(H2O)4]
With excess OH- ions, no change

Question 6

What is the colour change for the reaction of [Fe(H20]2+ with dropwise NH3 ions?
What is the complex formed?
What is the reaction with excess OH- ions?

Answer 6

Colour Change: Green Solution -> Green Precipitate
Complex Formed:
[Fe(OH)2(H2O)4]
With excess OH- ions, no change

Question 7

What is the colour change for the reaction of [Fe(H20)6]2+ with NH3?
What is the complex formed?
What is the reaction with excess NH3?

Answer 7

Colour Change: Green Solution -> Green Precipitate
Complex formed: Fe(OH)2(H2O)4
With excess NH3, no change

Question 8

What is the colour change for the reaction of [Fe(H2O)6]3+ with dropwise OH- ions?
What is the complex formed?
What is the reaction with excess OH-?

Answer 8

Colour Change: Yellow Solution -> Brown Precipitate
Complex formed: Fe(OH)3(H2O)2
With excess OH-, no change

Question 9

What is the reaction of [Fe(H2O)6]3+ with dropwise NH3?
What is the complex formed?
What is the reaction with excess NH3?

Answer 9

Colour Change: Yellow Solution -> Brown Precipitate
Complex Formed: Fe(OH)3(H20)2
With excess NH3, no change

Question 10

What is the colour change reaction of [Co(H2O)6]2+ with dropwise OH- ions?
What is the complex formed?
What is the reaction with excess OH- ions?

Answer 10

Colour Change: Pink Solution -> Blue Precipitate
Complex formed: Co(OH)2(H20)4
With excess OH- ions, no change

Question 11

What is the colour change reaction of [Co(H2O)6]2+ with dropwise NH3?
What is the complex formed?
What is the reaction with excess NH3?

Answer 11

Colour Change: Blue Solution -> Blue Precipitate
Complex Formed: Co(OH)2(H20)4
With excess NH3, yellow solution formed, [Co(NH3)6]2+

Question 12

What is the colour change reaction for [Cu(H2O)6]2+ with dropwise OH- ions?
What is the complex formed?
What is the reaction with excess OH- ions?

Answer 12

Colour Change: Blue Solution -> Blue precipitate
Complex formed: Cu(OH)2(H20)4
With excess OH- ions, no change

Question 13

What is the colour change reaction for [Cu(H2O)6]2+ with dropwise NH3?
What is the complex formed?
What is the reaction with excess NH3?

Answer 13

Colour Change: Blue Solution -> Blue Precipitate
Complex formed: Cu(OH)2(H20)4
With excess NH3, a dark blue solution forms, with the complex [Cu(NH3)4(H2O)2]2+