Complex ions // Ligand substitution

Question 1

[Fe(H2O)6]3+ and (Excess) OH-/NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 1

Fe(H2O)3(OH)3 (From yellow sol to brown ppt)

Question 2

[Fe(H2O)6]3+ and Na2CO3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 2

Fe(H2O)3(OH)3 (From yellow sol to brown ppt and CO2 bubbles)

Question 3

[Fe(H2O)6]2+ and (Excess) OH-/NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 3

Fe(H2O)4(OH)2 (From green sol to green ppt)

Question 4

[Fe(H2O)6]2+ and Na2CO3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 4

FeCO3 (From green sol to green ppt)

Question 5

[Fe(H2O)6]2+ and HCl (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 5

[FeCl4]2+ (From green sol to yellow sol)

Question 6

[Cr(H2O)6]3+ and OH-/NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 6

Cr(H2O)3(OH)3 (From ruby/violet/red sol to green ppt)

Question 7

[Cr(H2O)6]3+ and Excess OH- (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 7

[Cr(OH)6]3- (From ruby/violet/red sol to green sol)

Question 8

[Cr(H2O)6]3+ and Excess NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 8

[Cr(NH3)6]3+ (From ruby/violet/red sol to purple sol)

Question 9

[Cr(H2O)6]3+ and Na2CO3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 9

Cr(H2O)3(OH)3 (From ruby/violet/red sol to green ppt and CO2 bubbles)

Question 10

[Co(H2O)6]2+ and OH-/NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 10

Co(H2O)4(OH)2 (From pink sol to blue/green ppt)

Question 11

[Co(H2O)6]2+ and Excess OH (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 11

Co(H2O)4(OH)2 (From pink sol to blue/green ppt)

Question 12

[Co(H2O)6]2+ and Excess NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 12

[Co(NH3)6]2+ (From pink sol to straw sol)

Question 13

[Co(NH3)6]2+ and Air (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 13

[Co(NH3)6]3+ (From staw sol to brown sol)

Question 14

[Co(H2O)6]2+ and Na2CO3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 14

CoCO3 (From pink sol to pink ppt)

Question 15

[Co(H2O)6]2+ and HCl (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 15

[CoCl4]2- (From pink sol to blue sol)

Question 16

[Al(H2O)6]3+ and OH-/NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 16

Al(H2O)3(OH)3 (From colourless sol to white ppt)

Question 17

[Al(H2O)6]3+ and Excess OH- (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 17

[Al(OH)4(H2O)2]- (From colourless sol to colourless sol)

Question 18

[Al(H2O)6]3+ and Excess NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 18

Al(H2O)3(OH)3 (From colourless sol to white ppt)

Question 19

[Al(H2O)6]3+ and Na2CO3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 19

Al(H2O)3(OH)3 (From colourless sol to white ppt and CO2 bubbles)

Question 20

[Cu(H2O)6]2+ and OH-/NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 20

Cu(H2O)4(OH)2 (From pale blue sol to deep blue ppt)

Question 21

[Cu(H2O)6]2+ and Excess NH3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 21

[Cu(NH)4(H2O)2]2+ (From blue sol (intermediates- to blue ppt to pale blue sol) to deep blue sol)

Question 22

[Cu(H2O)6]2+ and HCl (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 22

[CuCl4]2- (From blue sol to yellow/green sol)

Question 23

[Cu(H2O)6]2+ and Na2CO3 (aq) (COLOUR CHANGE AND THE MAIN PRODUCT)

Answer 23

CuCO3 (From blue sol to blue/green ppt)