complex ion colours

Question 1

[Cu(H2O)6] / Cu2+ in aqueous solution

Accepted Answer

pale blue

Question 2

[Cu(H2O)6] / Cu2+ + OH- / NH3

Accepted Answer

Cu(OH)2(H2O)4 pale blue precipitate

Question 3

Cu(OH)2(H2O)4 + excess OH-

Accepted Answer

insoluble

Question 4

Cu(OH)2(H2O)4 + excess NH3

Accepted Answer

dark blue solution

Question 5

[Fe(H2O)6]2+ / Fe2+

Accepted Answer

pale green

Question 6

[Fe(H2O)6]2+ / Fe2+ + OH- / NH3

Accepted Answer

Fe(OH)2(H2O)4 dirty green precipitate

Question 7

Fe(OH)2(H2O)4 + excess OH-

Accepted Answer

insoluble

Question 8

Fe(OH)2(H2O)4 + excess NH3

Accepted Answer

insoluble

Question 9

[Fe(H2O)6]3+ / Fe3+

Accepted Answer

yellow

Question 10

[Fe(H2O)6]3+ / Fe3+ + OH- / NH3

Accepted Answer

Fe(OH)2(H2O)4 browny-red

Question 11

Fe(OH)2(H2O)4 + excess OH-

Accepted Answer

insoluble

Question 12

Fe(OH)2(H2O)4 + excess NH3

Accepted Answer

insoluble

Question 13

[Co(H2O)6]2+ / Co2+

Accepted Answer

pale pink

Question 14

[Co(H2O)6]2+ / Co2+ + OH- / NH3

Accepted Answer

Cu(OH)2(H2O)4 blue precipitate turns brown after a while

Question 15

Cu(OH)2(H2O)4 + excess OH-

Accepted Answer

insoluble

Question 16

Cu(OH)2(H2O)4 + excess NH3

Accepted Answer

Co(NH3)6 2+ pale brown solution that darkens over time

Question 17

[Cr(H2O)6]3+ / Cr3+

Accepted Answer

green

Question 18

[Cr(H2O)6]3+ / Cr3+ + OH-

Accepted Answer

Cr(H2O)3(OH)3 green precipitate

Question 19

[Cr(H2O)6]3+ / Cr3+ +NH3

Accepted Answer

Cr(H2O)3(NH3)3 green gray precipitate

Question 20

Cr(H2O)3(OH)3 + excess OH-

Accepted Answer

dark green solution

Question 21

Cr(H2O)3(NH3) + excess NH3

Accepted Answer

purple solution

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