Transition With Hydroxides

Question 1

[Cu(H2O)6]➡️ [Cu(H2O)4(OH)2

Answer 1

Pale blue solution➡️ blue ppt

Question 2

[Fe(H2O)6]➡️ [Fe(H2O)4(OH)2]

Answer 2

Pale green solution➡️ green ppt

Question 3

[Co(H2O)6]➡️ [Co(H2O)4(OH)2]

Answer 3

Pale pink solution➡️ blue ppt (turns pink on standing)

Question 4

[Fe(H20)6]➡️ [Fe(H2O)3(OH)3]

Answer 4

Yellow brown solution➡️ brown ppt

Question 5

[Cr(H2O)6]➡️ [Cr(H2O)3(OH)3]

Answer 5

Green solution➡️ grey green ppt

Question 6

True or false?? Cu +2 and Co +2 hydroxides both dissolve in excess ammonia.

Answer 6

True

Question 7

[Co(H2O)4(OH)2]➡️ [Co(NH3)6]

Answer 7

Blue ppt➡️ brown solution

Solution darkens on satening, oxidised by air

Question 8

[Cu(H2O)4(OH)2]➡️ [Cu(NH3)4(H2O)2]

Answer 8

Blue ppt➡️ deep blue solution

Question 9

True or false? Cr +3 dissolves in excess NH3.

Answer 9

True

Question 10

[Cr(H2O)3(OH)3]➡️ [Cr(NH3)6]

Answer 10

Grey-green ppt➡️ purple solution

Question 11

[Co(H2O)3(OH)3]➡️ [Co(NH3)6]

Answer 11

Blue (or pink) ppt➡️ yellow-brown solution