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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
Br2 and I-
Violet colour from I2
26
Cl2 in water
Pale green
27
Cl2 in cyclohexane
Pale green
28
Br2 in water
Orange
29
Br2 in cyclohexane
Orange
30
I2 in water
Brown
31
I2 in cyclohexane
Violet
32
How to go from Fe3 to 2+
Iodide ions
33
How to go from Fe2+ to 3+
MnO4-, Cl2
34
CrO4(2-)
Yellow
35
MnO4-
Purple
36
Mn2+
Colourless
37
Cr2+
Blue

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