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AQA A-Level Chemistry > Reactions of ions in aqueous solutions > Flashcards

Reactions of ions in aqueous solutions Flashcards

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1
Q

State what you would observe when NaOH is added to the aqueous ion of Fe (II)

A

Green ppt formed which goes brown when left standing in air

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2
Q

State what you would observe when NaOH is added to the aqueous ion of Cu (II)

A

(Light) blue ppt formed

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3
Q

State what you would observe when NaOH is added to the aqueous ion of Fe (III)

A

Brown ppt formed (may look orange-brown)

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4
Q

State what you would observe when NaOH is added to the aqueous ion of Al (III)

A

White ppt formed

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5
Q

State what you would observe when NaOH is added to the aqueous ion of Co (II)

A

(Dark) blue ppt formed

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6
Q

What colour is the solution of the aqueous ion of Fe (II)?

A

Green

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7
Q

What colour is the solution of the aqueous ion of Fe (III)?

A

Purple (may look yellow-brown)

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8
Q

What colour is the solution of the aqueous ion of Al (III)?

A

Colourless

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9
Q

What colour is the solution of the aqueous ion of Cu (II)?

A

Blue

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10
Q

What colour is the solution of the aqueous ion of Co (II)?

A

Pink

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11
Q

The aqueous ion of Fe (III) is purple. However, the solution sometimes appears yellow-brown. Why is this?

A

Some [Fe(H2O)5(OH)2]2+ has been formed

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12
Q

NaOH is added to Fe (I) and a green ppt is formed. Excess NaOH is then added. What will be observed (if anything)?

A

No further change

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13
Q

NaOH is added to Cu (II) and a blue ppt is formed. Excess NaOH is then added. What will be observed (if anything)?

A

No further change

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14
Q

NaOH is added to Fe (III) and a brown ppt is formed. Excess NaOH is then added. What will be observed (if anything)?

A

No further change

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15
Q

NaOH is added to Al (III) and a white ppt is formed. Excess NaOH is then added. What will be observed (if anything)?

A

Colourless soln. formed (but different complex from original aq ion)

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16
Q

State what you would observe when NH3 is added to the aqueous ion of Fe (II)

A

Green ppt formed which goes brown on standing in air

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17
Q

State what you would observe when NH3 is added to the aqueous ion of Cu (II)

A

(Light) blue ppt formed

18
Q

State what you would observe when NH3 is added to the aqueous ion of Fe (III)

A

Brown ppt (may look orange-brown)

19
Q

State what you would observe when NH3 is added to the aqueous ion of Al (III)

A

White ppt formed

20
Q

State what you would observe when excess NH3 is added to the aqueous ion of Co (II)

A

Pale brown soln. formed

21
Q

NH3 is added to Fe (II) and a green ppt is formed. Excess NH3 is then added. What will be observed (if anything)?

A

No further change

22
Q

NH3 is added to Cu (II) and a blue ppt is formed. Excess NH3 is then added. What will be observed (if anything)?

A

Deep blue soln. formed

23
Q

NH3 is added to Fe (III) and a brown ppt is formed. Excess NH3 is then added. What will be observed (if anything)?

A

No further change

24
Q

NH3 is added to Al (III) and a white ppt is formed. Excess NH3 is then added. What will be observed (if anything)?

A

No further change

25
Q

State what you would observe when Na2CO3 is added to the aqueous ion of Fe (II)

A

(Light) green ppt formed

26
Q

State what you would observe when Na2CO3 is added to the aqueous ion of Cu(II)

A

Blue-green ppt formed

27
Q

State what you would observe when Na2CO3 is added to the aqueous ion of Fe (III)

A

Brown ppt formed (may look orange brown)
CO2 gas released

28
Q

State what you would observe when Na2CO3 is added to the aqueous ion of Al (III)

A

White ppt
CO2 gas evolved

29
Q

State what you would observe when Na2CO3 is added to the aqueous ion of Co (II)

A

Purple ppt formed

30
Q

State what you would observe when HCl is added to the aqueous ion of Cu (II)

A

Yellow soln. formed (may look green)

31
Q

State what you would observe when HCl is added to the aqueous ion of Co (II)

A

Blue soln. formed

32
Q

A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A yellow soln. is formed. What is the oxidation state of vanadium?

A

V (V)

33
Q

A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A blue soln. is formed. What is the oxidation state of vanadium?

A

4

34
Q

A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A green soln. is formed. What is the oxidation state of vanadium?

A

V (III)

35
Q

A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A violet/purple soln. is formed. What is the oxidation state of vanadium?

A

V (II)

36
Q

V (II) forms what colour solution?

A

Violet/purple

37
Q

V (III) forms what colour solution?

A

Green

38
Q

V (IV) forms what colour solution?

A

Blue

39
Q

V (V) forms what colour solution?

A

Yellow

40
Q

Which is more acidic of M3+ and M2+ and why? (M=metal)

A

M3+
It has a greater polarising power as it is smaller and has a greater charge than M2+
This means the O-H bond breaks more easily and so more H+ are released

AQA A-Level Chemistry (36 decks)

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