Inorganic II - Reactions of metal aqua ions

Question 1

What are the acid-base properties of metal aqua ions?

Answer 1

When these ions are in solution they are acidic. Metal atoms that form 2+ ions form weaker acidic solutions than metal atoms form 3+ ions.

Question 2

What is the reaction between a complex of Fe2+ and NaOH?

Answer 2

[Fe(H2O)6]2+ + 2OH- → [Fe(H2O)4(OH)2] + 2H2O

Question 3

What is the observation of the reaction between a complex of Fe2+ and NaOH?

Answer 3

Green precipitate

Question 4

What is the reaction between a complex of Cu2+ and NaOH?

Answer 4

[Cu(H2O)6]2+ + 2OH- → [Cu(H2O)4(OH)2] + 2H2O

Question 5

What is the observation of the reaction between a complex of Cu2+ and NaOH?

Answer 5

Blue precipitate

Question 6

What is the reaction between a complex of Fe3+ and NaOH?

Answer 6

[Fe(H2O)6]3+ + 3OH- → [Fe(H2O)4(OH)2] + 3H2O

Question 7

What is the observation of the reaction between a complex of Fe3+ and NaOH?

Answer 7

Brown precipitate

Question 8

What is the reaction between a complex of Al3+ and NaOH?

Answer 8

[Al(H2O)6]3+ + 3OH- → [Al(H2O)4(OH)2] + 3H2O

Question 9

What is the observation of the reaction between a complex of Al3+ and NaOH?

Answer 9

White precipitate

Question 10

What is an amphoteric salt?

Answer 10

A salt that can act as both an acid or a base.

Question 11

What is the reaction between a complex of Al3+ and NaOH in excess?

Answer 11

[Al(H2O)3(OH)3] → [Al(H2O)2(OH)4
This means the solution goes colourless.

Question 12

What is the difference when ammonia is added?

Answer 12

NH4+ is a product.

Question 13

What is the reaction between Cu2+ salt and an excess of NH3?

Answer 13

[Cu(H2O)4(OH)2] + 4NH3 → [Cu(H2O)2(NH3)4]2+ + 2H2O + 2OH-

Question 14

What is the opbservation of the reaction between Cu2+ salt and an excess of NH3?

Answer 14

Formation of a deep blue solution.

Question 15

What is the equation of the reaction between an Fe2+ complex and Na2CO3?

Answer 15

[Fe(H2O)6]2+ + CO32- → FeCO3 + 6H2O

Question 16

What is the equation of the reaction between an Cu2+ complex and Na2CO3?

Answer 16

[Cu(H2O)6]2+ + CO32- → CuCO3 + 6H2O

Question 17

What is the equation of the reaction between an Fe3+ complex and Na2CO3?

Answer 17

2[Fe(H2O)6]3+ + 3CO32- → 2[Fe(H2O)3(OH)3] + 3H2O + 3CO2

Question 18

What is the equation of the reaction between an Al3+ complex and Na2CO3?

Answer 18

2[Al(H2O)6]3+ + 3CO32- → 2[Al(H2O)3(OH)3] + 3H2O + 3CO2

Question 19

What is the equation of the reaction between an Fe2+ complex and Cl- ions?

Answer 19

[Fe(H2O)6]2+ + 4Cl- → [FeCl4]2- + 6H2O

Question 20

What is the observation of the reaction between an Fe2+ complex and Cl- ions?

Answer 20

Yellow precipitate formed

Question 21

What is the equation of the reaction between an Cu2+ complex and Cl- ions?

Answer 21

[Cu(H2O)6]2+ + 4Cl- → [CuCl4]2- + 6H2O

Question 22

What is the equation of the reaction between an Fe3+ complex and Cl- ions?

Answer 22

[Fe(H2O)6]3+ + 4Cl- → [FeCl4]- + 6H2O

Question 22

What is the observation of the reaction between an Cu2+ complex and Cl- ions?

Answer 22

Green precipitate forms

Question 23

What is the observation of the reaction between an Fe3+ complex and Cl- ions?

Answer 23

Yellow precipitate forms

Question 24

What is the equation of the reaction between an Al3+ complex and Cl- ions?

Answer 24

[Al(H2O)6]3+ + 4Cl- → [AlCl4]- + 6H2O

Question 25

What is the observation of the reaction between an Al3+ complex and Cl- ions?

Answer 25

White precipitate