Aqua Ions

Question 1

What is the formula for the reaction involving [Fe(H2O)6]2+ and OH-?

Answer 1

[Fe(H2O)6]2+ + 2OH- → Fe(OH)2 + 6H2O

This equation represents the formation of iron(II) hydroxide from the aqueous complex.

Question 2

What is produced when [Fe(H2O)3]+ reacts with OH-?

Answer 2

[Fe(H2O)3]+ + 3OH- → Fe(OH)3(H2O)3 + 3H2O

This is the precipitation of iron(III) hydroxide.

Question 3

What is the product of the reaction between [Al(H2O)6]3+ and OH-?

Answer 3

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

This reaction forms aluminum hydroxide.

Question 4

What happens when excess NaOH is added to [Al(H2O)6]3+?

Answer 4

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

This shows the formation of the aluminate ion.

Question 5

What is the outcome of the reaction [Cu(H2O)6]2+ with NH3?

Answer 5

[Cu(H2O)6]2+ + 4NH3 → [Cu(NH3)4(H2O)2]2+ + 2H2O

This reaction illustrates the complexation of copper(II) with ammonia.

Question 6

What is formed when [Cu(H2O)6]2+ reacts with Cl-?

Answer 6

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

This reaction demonstrates the formation of a tetrahedral copper(II) chloride complex.

Question 7

What is the result of the reaction [Fe(H2O)6]3+ with CO32-?

Answer 7

[Fe(H2O)6]3+ + CO32- → FeCO3 + 6H2O

This shows the precipitation of iron(III) carbonate.

Question 8

What is produced when [Al(H2O)6]3+ reacts with CO32-?

Answer 8

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

This reaction leads to the formation of aluminum hydroxide and carbon dioxide.

Question 9

What type of reaction occurs with transition metals and their ligands?

Answer 9

Acid-base reaction

Transition metals often engage in acid-base chemistry with ligands.

Question 10

True or False: Ligands can act as Brønsted-Lowry acids.

Answer 10

True

Ligands can donate protons, qualifying as acids in acid-base reactions.

Question 11

Fill in the blank: [Cu(H2O)6]2+ + CO32- → _______ + 6H2O.

Answer 11

CuCO3

This reaction shows the formation of copper(II) carbonate.

Question 12

What is the product when [Fe(H2O)6]2+ reacts with carbonate ions?

Answer 12

FeCO3 + 6H2O

This indicates the precipitation of iron(II) carbonate.

Question 13

What is the effect of higher charge density in transition metal complexes?

Answer 13

Increases acidity

Higher charge density often leads to stronger interactions with ligands.

Question 14

What happens when excess NH3 is added to [Cu(H2O)6]2+?

Answer 14

[Cu(NH3)4(H2O)2]2+ + 2H2O

This shows the formation of a complex with ammonia, displacing water.

Question 15

What is the color of the complex [Fe(H2O)4(OH)2]?

Answer 15

Green

This complex indicates the presence of Fe in a specific oxidation state and coordination environment.

Question 16

What color is the complex [Fe(H2O)3(OH)3]?

Answer 16

Brown precipitate

This is a common observation in iron(III) complexes.

Question 17

What is the color of the complex [Ag(H2O)2]+?

Answer 17

Colorless

This indicates the presence of silver in an aqueous environment.

Question 18

What happens to the complex [Fe(H2O)4(OH)2] when excess OH- is added?

Answer 18

Redissolves

The redissolving indicates the formation of soluble complexes with excess hydroxide.

Question 19

What is the color of the precipitate formed by FeCO3?

Answer 19

Green precipitate

This is characteristic of iron(II) carbonate.

Question 20

What color is the complex [Cu(H2O)4]2+?

Answer 20

Blue-green precipitate

This indicates the presence of copper in an aqueous environment.

Question 21

What is the color of the complex [Ag(NH3)2]+?

Answer 21

Deep blue precipitate

This complex is often formed in the presence of ammonia.

Question 22

What color precipitate does [Al(H2O)3(OH)3] form?

Answer 22

White precipitate

This is typical for aluminum hydroxide complexes.

Question 23

What happens to [Fe(H2O)4(OH)2] upon standing?

Answer 23

Goes brown precipitate due to oxidation

This indicates the conversion from Fe(II) to Fe(III) complexes.

Question 24

Complete the sentence: AgCl forms a _______ precipitate.

Answer 24

White

This is a common silver salt precipitate.

Question 25

What is the effect of adding excess NH3 to Ag+?

Answer 25

Forms [Ag(NH3)2]+ complex ## Footnote This complex is soluble and indicates coordination chemistry with ammonia.

Question 26

What is the oxidation reaction involving Fe2+ and Fe3+?

Answer 26

Fe2+ → Fe3+ + e- ## Footnote This reaction is crucial in redox chemistry involving iron.

Question 27

What color does the complex [Fe(H2O)3(OH)3] exhibit?

Answer 27

Brown precipitate ## Footnote Indicates the formation of iron(III) hydroxide.

Question 28

What color is the precipitate formed by [Ag(H2O)2]+?

Answer 28

Colorless ## Footnote Represents the aqueous form of silver ions.

Question 29

Fill in the blank: The complex [Fe(H2O)4(OH)2] is _______.

Answer 29

Green ## Footnote This indicates a specific coordination environment around iron.

Question 30

What is the color of the precipitate formed by [Ag(NH3)2]+?

Answer 30

Deep blue precipitate ## Footnote This indicates the formation of a silver-ammonia complex.

Question 31

What is the color of the complex [Al(H2O)3(OH)3]?

Answer 31

White precipitate ## Footnote Commonly observed in aluminum hydroxide formations.

Question 32

What happens to the precipitate of FeCO3 in excess OH-?

Answer 32

Redissolves ## Footnote This indicates the formation of soluble hydroxide complexes.