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Chemistry: CHEM 5 > Reactions and Colours > Flashcards

Reactions and Colours Flashcards

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1
Q

Cr 6+

A

Orange

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2
Q

Cr 3+

A

Green

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3
Q

Cr 2+

A

Blue

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4
Q

Cr2O7 2-

A

Orange

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5
Q

CrO4 2-

A

Yellow

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6
Q

MnO4 -

A

Purple

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7
Q

Mn 2+

A

Pink

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8
Q

Fe 2+

A

Green

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9
Q

Fe 3+

A

Pale violet

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10
Q

[Fe(H2O)6] 2+

A

Pale green

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11
Q

[Fe(H2O)6] 2+ with NaOH

A

Green gelatinous ppt of Fe(H2O)4(OH)2

-Soon oxidised by air to brown [Fe(H2O)3(OH)3]-

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12
Q

[Fe(H2O)6] 2+ with excess NaOH

A

No change
Green gelatinous ppt of Fe(H2O)4(OH)2
-Soon oxidised by air to brown [Fe(H2O)3(OH)3]-

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13
Q

[Fe(H2O)6] 2+ with NH3

A

Green gelatinous ppt of Fe(H2O)4(OH)2

-Soon oxidised by air to brown [Fe(H2O)3(OH)3]-

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14
Q

[Fe(H2O)6] 2+ with excess NH3

A

No change
Green gelatinous ppt of Fe(H2O)4(OH)2
-Soon oxidised by air to brown [Fe(H2O)3(OH)3]-

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15
Q

[Fe(H2O)6] 2+ with Na2CO3

A

Green precipitate of FeCO3

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16
Q

[Co(H2O)6] 2+

A

Pink

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17
Q

[Co(H2O)6] 2+ with NaOH

A

Blue ppt of CO(H2O)4(OH)2

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18
Q

[Co(H2O)6] 2+with excess NaOH

A

No change

Blue ppt of CO(H2O)4(OH)2

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19
Q

[Co(H2O)6] 2+ with NH3

A

Blue ppt of CO(H2O)4(OH)2

20
Q

[Co(H2O)6] 2+ with excess NH3

A

Pale yellow-brown sol of [Co(NH3)6]2+

  • Oxidised by air to dark brown mixture containing Co(II) compounds.
  • A blue ppt is formed as an intermediate
21
Q

[Co(H2O)6] 2+ with Na2CO3

A

Pink ppt of CoCO3

22
Q

[Co(H2O)6] 2+ with HCl

A

Dark blue sol of [CoCl4]2-

23
Q

[Cu(H2O)6] 2+

A

Pale blue

24
Q

[Cu(H2O)6] 2+with NaOH

A

Pale blue ppt of Cu(H2O)4(OH)2

25
Q

[Cu(H2O)6] 2+ with excess NaOH

A

No change

Pale blue ppt of Cu(H2O)4(OH)2

26
Q

[Cu(H2O)6] 2+ with NH3

A

Pale blue ppt of Cu(H2O)4(OH)2

27
Q

[Cu(H2O)6] 2+ with excess NH3

A

Deep blue ppt of [Cu(NH3)4(H2O)2]2+

28
Q

[Cu(H2O)6] 2+ with Na2CO3

A

Blue-green ppt of CuCO3

29
Q

[Cu(H2O)6] 2+ with HCl

A

Yellow sol of [CuCl4]2-

-Likely to appear green as some blue [Cu(H2O)6)]2- will remain.

30
Q

[Fe(H2O)6] 3+

A

Purple/yellow/brown

31
Q

[Fe(H2O)6] 3+ with NaOH

A

Brown gelatinous ppt of Fe(H2O)3(OH)3

32
Q

[Fe(H2O)6] 3+ with excess NaOH

A

No change

Brown gelatinous ppt of Fe(H2O)3(OH)3

33
Q

[Fe(H2O)6] 3+ with NH3

A

Brown gelatinous ppt of Fe(H2O)3(OH)3

34
Q

[Fe(H2O)6] 3+ with excess NH3

A

No change

Brown gelatinous ppt of Fe(H2O)3(OH)3

35
Q

[Fe(H2O)6] 3+ with Na2CO3

A

Brown gelatinous ppt of [Fe(H2O)3(OH)3] with bubbles of CO2

36
Q

[Al(H2O)6] 3+

A

Colourless

37
Q

[Al(H2O)6] 3+ with NaOH

A

White ppt of Al(H2O)3(OH)3

38
Q

[Al(H2O)6] 3+ with excess NaOH

A

Colourless sol of [Al(OH)4]-

39
Q

[Al(H2O)6] 3+ with NH3

A

White ppt of Al(H2O)3(OH)3

40
Q

[Al(H2O)6] 3+ with excess NH3

A

No change

White ppt of Al(H2O)3(OH)3

41
Q

[Al(H2O)6] 3+ with Na2CO3

A

White ppt of [Al(H2O)3(OH)3] with bubbles of CO2

42
Q

[Cr(H2O)6] 3+

A

Violet/ruby

43
Q

[Cr(H2O)6] 3+ with NaOH

A

Green ppt of Cr(H2O)3(OH)3

44
Q

[Cr(H2O)6] 3+ with excess NaOH

A

Green sol of [Cr(OH)6]3-

45
Q

[Cr(H2O)6] 3+ with NH3

A

Green ppt of Cr(H2O)3(OH)3

46
Q

[Cr(H2O)6] 3+ with excess NH3

A

Purple sol of [Cr(NH3)6]3+

-A green ppt is formed as an intermediate

47
Q

[Cr(H2O)6] 3+ with Na2CO3

A

Green ppt of Cr(OH)3 + with bubbles of CO2

Chemistry: CHEM 5 (6 decks)

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