Metal-Aqua Ions

Question 1

Cu(H2O)6 2+ + H2O

Answer 1

Cu(H2O)6 2+ + H2O -> Cu(OH)(H2O)5 + +H3O+

Question 2

Al(OH)3(H2O)3 + OH-

Answer 2

Al(OH)3(H2O)3 + OH- -> Al(OH)4- + 3H2O

Question 3

Al(OH)3(H2O)3 + H3O+

Answer 3

Al(OH)3(H2O)3 + H3O+ -> Al(H20)6 3+ + 3H2O

Question 4

Cu(OH)2(H20)4 + 4NH3

Answer 4

Cu(OH)2(H20)4 + 4NH3 -> Cu(NH3)4(H2O)2 2+ + 2OH- +2H2O

Question 5

Metal-aqua ions reactions with sodium hydroxide

Answer 5

all four metal-aqua ions will form precipitates, but only the aluminium hydroxide will dissolve in an excess of sodium hydroxide. - amphoteric

Question 6

Metal-aqua ions reactions with ammonia

Answer 6

all four metal-aqua ions will form precipitates but only the copper hydroxide precipitate will dissolve in an excess of ammonia. - it undergoes a ligand exchange

Question 7

Metal-aqua ions reactions with sodium carbonate

Answer 7

The solutions containing Al3+ or Fe3+ will also form bubbles of CO2.

Question 8

Colour of [Cu(H2O)6]2+ + OH- or NH3

Answer 8

blue precipitate

Question 9

Colour of [Cu(H2O)6]2+ + excess OH-

Answer 9

blue solution

Question 10

Colour of [Cu(H2O)6]2+ + excess NH3

Answer 10

deep blue solution

Question 11

Colour of [Cu(H2O)6]2+ + Na2CO3

Answer 11

green-blue precipitate

Question 12

Colour of [Fe(H2O)6]3+ + OH- or NH3

Answer 12

green precipitate

Question 13

Colour of [Fe(H2O)6]3+ + excess OH-

Answer 13

green solution

Question 14

Colour of [Fe(H2O)6]3+ + excess NH3

Answer 14

green solution

Question 15

Colour of [Fe(H2O)6]3+ + Na2CO3

Answer 15

green precipitate

Question 16

Colour of [Al(H2O)6]3+ + OH- or NH3

Answer 16

white precipitate

Question 17

Colour of [Al(H2O)6]3+ + excess OH-

Answer 17

colourless solution

Question 18

Colour of [Al(H2O)6]3+ + excess NH3

Answer 18

colourless solution

Question 19

Colour of [Al(H2O)6]3+ + Na2CO3

Answer 19

white precipitate

Question 20

Colour of [FE(H2O)6]3+ + OH- or NH3

Answer 20

brown precipitate

Question 21

Colour of [FE(H2O)6]3+ + excess OH-

Answer 21

no change

Question 22

Colour of [FE(H2O)6]3+ + excess NH3

Answer 22

no change

Question 23

Colour of [FE(H2O)6]3+ + Na2CO3

Answer 23

brown precipitate