Reaction of Metal Ions in Aqueous Solution

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30 Terms

1
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Colour and formula of aqueous ion of Iron (II)

[Fe(H2O)6]2+(aq) green solution

2
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Colour and formula of action of NaOH on Iron (II)

Fe(H2O)4(OH)2(s)

green ppt goes brown on standing in air

3
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Colour and formula of action of excess NaOH on Iron (II)

No further change

4
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Colour and formula of action of NH3 on Iron (II)

Fe(H2O)4(OH)2(s)

green ppt goes brown on standing in air

5
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Colour and formula of action of excess NH3 on Iron (II)

No further change

6
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Colour and formula of action of Na2CO3 on Iron (II)

FeCO3(s) green precipitate

7
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Colour and formula of aqueous ion of copper (II)

[Cu(H2O)6]2+ (aq) blue solution

8
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Colour and formula of action of NaOH on copper (II)

Cu(H2O)4(OH)2(s) blue precipitate

9
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Colour and formula of action of excess NaOH on copper (II)

No further change

10
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Colour and formula of action of NH3 on Copper (II)

Cu(H2O)4(OH)2(s) blue ppt

11
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Colour and formula of action of excess NH3 on copper (II)

[Cu(H2O)2(NH3)4]2+(aq) deep blue solution

12
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Colour and formula of action of Na2CO3 on copper (II)

CuCO3(s) blue-green ppt

13
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Colour and formula of aqueous ion of iron (III)

[Fe(H2O)6]3+(aq) purple solution; may look yellow brown due to some [Fe(H2O)5(OH)]2

14
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Colour and formula of action of NaOH on Iron (III)

Fe(H2O)3(OH)3(s) brown ppt

(ppt may look orange-brown)

15
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Colour and formula of action of excess NaOH on Iron (III)

No further change

16
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Colour and formula of action of NH3 on Iron (III)

Fe(H2O)3(OH)3(s) brown ppt; may look orange-brown

17
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Colour and formula of action of excess NH3 on Iron (III)

No further change

18
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Colour and formula of action of Na2CO3 on Iron (III)

Fe(H2O)3(OH)3(s) brown ppt; may look orange-brown

And CO2 gas evolved

19
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Colour and formula of aqueous ion of aluminium (III)

[Al(H2O)6]3+(aq) colourless solution

20
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Colour and formula of action of NaOH on aluminium (III)

Al(H2O)3(OH)3(s) white ppt

21
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Colour and formula of action of excess NaOH on aluminium (III)

[Al(OH)4]–(aq) colourless solution

22
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Colour and formula of action of NH3 on Iron (II)

Al(H2O)3(OH)3(s) white ppt

23
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Colour and formula of action of excess NH3 on aluminium (III)

No further change

24
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Colour and formula of action of Na2CO3 on aluminium (III)

Al(H2O)3(OH)3(s) white ppt and CO2 gas evolved

25
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Species of vanadium (V) in acidic solution and colour

[VO2(H2O)4]+

Yellow

26
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Species of vanadium (IV) in acidic solution and colour

[VO(H2O)5]2+

Blue

27
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Species of vanadium (III) in acidic solution and colour

[V(H2O)6]3+

Green

28
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Species of vanadium (II) in acidic solution and colour

[V(H2O)6]2+

Purple

29
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Why does [M(H2O)6]3+ form more acidic complexes than [V(H2O)6]2+ ?

The [M(H2O)6]3+ complex has a higher charge density due to the increased positive charge, which enhances the ability to polarize water molecules, and release H+ into solution, leading to increased acidity compared to the [V(H2O)6]2+ complex.

30
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