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Cheeeeeeem > Colours > Flashcards

Colours Flashcards

1
Q

Hexaaqua copper

A

Blue

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2
Q

Hexaaqua chromium

A

Violet

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3
Q

Hexaaqua iron 2+

A

Green

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4
Q

Hexaaqua iron 3+

A

Yellow

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5
Q

Hexaaqua manganate

A

Light pink

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6
Q

Cu2+ and NaOH/NH3

A

Blue solution to blue ppt

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7
Q

Cr3+ and NaOH/NH3

A

Violet solution to green ppt

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8
Q

Fe3+ and NaOH/NH3

A

Yellow solution to orange/brown ppt

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9
Q

Fe2+ and NaOH/NH3

A

Green solution to green ppt

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10
Q

Mn2+ and NaOH/NH3

A

Pale pink solution to pale brown ppt

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11
Q

Excess NaOH reacts with

A

Only Cr
Violet solution to green ppt to dark green solution

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12
Q

Excess NH3 reacts with

A

Cr and Cu (Ceeeeees)
Cr: Violet solution to green ppt to purple solution [Cr(NH3)6]3+
Cu: pale blue solution to blue ppt to deep blue solution [Cu(NH3)4(H2O)2]2+

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13
Q

Blue solution

A

Hexaaqua copper

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14
Q

Green solution

A

Hexaaqua iron 2+

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15
Q

Yellow solution

A

Hexaaqua iron 3+

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16
Q

Violet solution

A

Hexaaqua chromium

17
Q

Pale pink solution

A

Hexaaqua manganate

18
Q

Pale brown ppt

19
Q

Blue ppt

20
Q

Green ppt

A

Cr(OH)3 and Fe(OH)2

21
Q

Orange/brown ppt

22
Q

How to test for transition metals?

A

Add NaOH, see colour of ppt and add excess to see if it dissolves
Can also use NH3

23
Q

Cl2 and I-

A

Violet colour from I2

24
Q

Cl2 and Br-

A

Orange colour from Br2

25
Q

Br2 and I-

A

Violet colour from I2

26
Q

Cl2 in water

A

Pale green

27
Q

Cl2 in cyclohexane

A

Pale green

28
Q

Br2 in water

29
Q

Br2 in cyclohexane

30
Q

I2 in water

31
Q

I2 in cyclohexane

32
Q

How to go from Fe3 to 2+

A

Iodide ions

33
Q

How to go from Fe2+ to 3+

A

MnO4-, Cl2

34
Q

CrO4(2-)

35
Q

MnO4-

36
Q

Mn2+

A

Colourless

37
Q

Cr2+

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