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Chemistry (A2) > Aqua Metal Ions > Flashcards

Aqua Metal Ions Flashcards

1
Q

Write the equation and observed reaction for the reaction between a Copper Aqua complex and a few drops of OH-(aq)

(Excess same as this)

A

Blue Solution ——-> Blue precipitate

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2
Q

Write the equation and observed reaction for the reaction between a Colbolt Aqua complex and a few drops of OH-(aq)

(Excess same as this)

A

Pink Solution ——-> Blue Precipitate

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3
Q

Write the equation and observed reaction for the reaction between a Aluminium Aqua complex and a few drops of OH-(aq)

A

Clear and Colourless Solution ——> White Precipitate

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4
Q

Write the equation and observed reaction for the reaction between a Iron(3+) Aqua complex and a few drops of OH-(aq)

(Excess same as this)

A

Purple Solution ——-> Brown Precipitate

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5
Q

Write the equation and observed reaction for the reaction between a Iron(2+) Aqua complex and a few drops of OH-(aq)

(Excess same as this)

A

Green Solution ——> Green Precipitate ——> Brown (on standing)

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6
Q

Write the equation and observed reaction for the reaction between a Aluminium Aqua complex and excess OH-(aq)

A

Clear and Colourless solution ——> White Precipitate ———> Colourless solution (precipitate dissolves)

+ 3 H2O on products

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7
Q

Write the equation and observed reaction for the reaction between a Copper Aqua complex and a few drops of NH3(aq)

A

Blue Solution ——-> Blue Precipitate

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8
Q

Write the equation and observed reaction for the reaction between a Colbolt Aqua complex and a few drops of NH3(aq)

A

Pink Solution ——-> Blue Precipitate

(2NH4+ not one)

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9
Q

Write the equation and observed reaction for the reaction between a Iron(2+) Aqua complex and a few drops of NH3(aq)

A

Green Solution ———-> Green Precipitate ———> Brown precipitate (on standing)

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10
Q

Write the equation and observed reaction for the reaction between a Aluminium Aqua complex and a few drops of NH3(aq)

(Same as Excess)

A

Clear and Colourless Solution ——> White Precipitate

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11
Q

Write the equation and observed reaction for the reaction between a Iron(3+) Aqua complex and a few drops of NH3(aq)

A

Purple Solution ——> Brown Precipitate

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12
Q

Write the equation and observed reaction for the reaction between a Copper Aqua complex and Excess NH3(aq)

A

Ligand Substitution Reaction

Blue Solution ——> Blue Precipitate —-> Deep Blue Solution

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13
Q

Write the equation and observed reaction for the reaction between a Colbolt 2+ Aqua complex and Excess NH3(aq)

A

Pink Solution —-> Blue Precipitate —-> Pale Brown Solution

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14
Q

Write the equation and observed reaction for the reaction between a Copper Aqua complex and a Carbonate ion (CO3 2- ) (aq)

A

Blue Solution ——-> Blue Green Precipitate

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15
Q

Write the equation and observed reaction for the reaction between a Colbolt Aqua complex and a Carbonate ion (CO3 2- ) (aq)

A

Pink Solution ——-> Purple Precipitate + Water

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16
Q

Write the equation and observed reaction for the reaction between a Iron (2+) Aqua complex and a Carbonate ion (CO3 2- ) (aq)

A

(2+ on Complex)

Green Solution ——-> Green precipitate + Water

17
Q

Write the equation and observed reaction for the reaction between a Copper Aqua complex and Hydrochloric Acid (HCl) (aq)

A

Blue Solution ——-> Yellow Solution with a green tinge

Tetrahedral change in structure

18
Q

Write the equation and observed reaction for the reaction between a Colbolt Aqua complex and Hydrochloric Acid (HCl) (aq)

A

Pink Solution ——-> Blue solution

tetrahedral Change in structure

-2 charge on Colbolt chloride

19
Q

Write the equation and observed reaction for the reaction between a Aluminium Aqua complex and a Carbonate ion (CO3 2- ) (aq)

A

Clear and Colourless Solution ——-> White Precipitate + effervescence

20
Q

Write the equation and observed reaction for the reaction between a Iron (3+) Aqua complex and a Carbonate ion (CO3 2- ) (aq)

A

Purple Solution ——-> Brown precipitate + effervescence

21
Q

Why are Metal-Aqua Ions Acidic in solution

A

Complex ions react with water (hydrolysis)

Aqua complex ions Dissociate Weakly

Thus Produces H+ ions

Within Solution H+ ions produce the hydronium ion making the solution more acidic

22
Q

Why are 3+ Metal-Aqua ions are more acidic then 2+ Metal aqua ions

A

3+ Metal ions have a larger charge density (larger charge and smaller)

As a result the 3+ ions are more polarising

They attract the electrons in the O-H in the bond more strongly towards the metal ion, which weakens the bond

This means the H+ ion is more readily released which goes on to from more hydroxonium ions

23
Q

What does Amphoteric Mean?

A

A substance that can act as a Bronstead-Lowry Acid and Base

24
Q

Name an example for an amphoteric metal hydroxide

A

Hydrated Aluminium Hydroxide

25
Q

Why does Ammonia form Metal hydroxides

A

When ammonia is in solution, an equilibrium is met as it is a weak base

NH3 dissociates poorly into NH4+ and H-

Metal Aqua complexes react with the H- ions formed to form a hydroxide

26
Q

What can happen when Excess NH3 is added to a TM ion

A

Some Metal Hydroxides that from

react with the ammonia via a partial ligand substitution or full , to form a soluble complex

27
Q

What colour are the following metal aqua ions
Cu2+
Co2+

A

Cu2+ = Blue
Co2+ = Pink

28
Q

What colour are the following metal hexaqua ions
Fe2+
Fe3+
Al3+

A

Fe2+ = Green
Fe3+ = Purple
Al3+ = Clear and Colourless

29
Q

Write the equation and observed reaction for the reaction between a Iron 3+ Aqua complex and Hydrochloric Acid (HCl) (aq)

A

Purple Solution —-> Pale Brown Precipitate

30
Q
A

D
Gallium is a 3+ ion
when a 3+ ion reacts with a Carbonate a Hydroxide is produced with water and carbon dioxide

31
Q

Give an ionic equation for the conversation of [CuCl4]2- when exposed to excess aqueous ammonia

What is The colour change observed

A

Yellow—-> Deep Blue Solution

32
Q

Why would a solution containing [Al(H20)6] have a ph < 7

A

Al3+ central metal ion has a high charge density and small size

This weakens the bond and increases the polarisation of the O-H bonds

Releasing H+ ions

33
Q

State an observation when Sodium Carbonate is added to a solution of [Al(H20)6]

A

Bubbles of effervescence

Clear and colourless to white precipitate

34
Q

Write and equation to show how an aluminium aqua complex can act as a Brønsted-lowry Acid with water

A
35
Q

What is/are the reagent for reducing a Fe3+ aqua ion to a Fe2+ ion

A

Zinc with HCl

Chemistry (A2) (15 decks)

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