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Chemistry > Qualitative Analysis > Flashcards

Qualitative Analysis Flashcards

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1
Q

Colour of [Fe(H2O)6]2+
Colour + NaOH
Is it soluble in XS NaOH?

A

Pale green
Green
Insoluble in XS NaOH

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2
Q

Colour of [Fe(H2O)6]3+
Colour + NaOH
Is it soluble in XS NaOH?

A

Pale yellow
Orange-brown
Insoluble in XS NaOH

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3
Q

Colour of [Cu(H2O)6]2+
Colour + NaOH
Is it soluble in XS NaOH?

A

Pale Blue
Blue
Insoluble in XS NaOH

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4
Q

Colour of [Mn(H2O)6]2+
Colour + NaOH
Is it soluble in XS NaOH?

A

Pale pink
Brown
Insoluble in XS NaOH

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5
Q

Colour of [Cr(H2O)6]3+
Colour + NaOH
Is it soluble in XS NaOH?

A

Violet
Green
It is soluble in XS NaOH. The solid Cr(OH)3 reacts with NaOH to form a dark green solution of [Cr(OH)6]3-

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6
Q

How would you test for the ammonium ion?

A

React with NaOH. If ammonia is produced then the damp red pH indicator paper should go blue

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7
Q

How would you test for the carbonate ion?

A

Add dilute HNO3. You would see effervescence as CO2 is produced

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8
Q

How would you test for the sulphate ion?

A

Add Ba2+ ions (usually through barium nitrate) and look for a white precipitate of BaSO4

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9
Q

How would you test for the halide ions?

A

Add AgNO3 and look for a precipitate

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10
Q

What colour is the silver Chloride precipitate?

A

White

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11
Q

What colour is the silver bromide precipitate?

A

Cream

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12
Q

What colour is the silver Iodide precipitate?

A

Yellow

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13
Q

Is AgBr soluble in dilute NH3?

A

No only AgCl is

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14
Q

Is AgI soluble in conc NH3?

A

Yes and so is AgBr

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15
Q

What is the order of the anion tests? And why

A

Carbonate - sulfate/halide don’t produce CO2 (no carbon)
Sulfate - BaCO3 is also a white precipitate
Halide - both Ag2CO3 and Ag2SO4 are precipitates

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16
Q

What is the reaction when [Cu(H2O)6]2+ is added to NH3?

A

[Cu(H2O)6]2+ + 4NH3 [Cu(NH3)4(H2O)2]2+ + H2O

17
Q

What is the reaction when [Cu(H2O)6]2+ is added to HCl?

A

[Cu(H2O)6]2+ + 4Cl- [CuCl4]2- + 6H2O

18
Q

What is the reaction when [Cr(H2O)6]2+ is added to NH3?

A

[Cr(H2O)6]2+ + 6NH3 [Cr(NH3)6]2+ + 6H2O

19
Q

What colour is [Cu(NH3)4(H2O)2]2+

A

Dark blue

20
Q

What colour is [CuCl4]2-?

A

Yellow

21
Q

What colour is [Cr(NH3)6]3+

A

Purple

22
Q

Colour of [Co(H20)6]2+

A

Pink

23
Q

Colour of [CoCl4]2-

A

Blue

24
Q

What colour does Cr3+ go in XS NH3?

A

Purple

25
Q

What colour does Cu2+ go in XS NH3?

A

Dark blue

26
Q

Colour of Mn7+

A

Purple

27
Q

Colour of Cr2+

A

Blue

28
Q

Colour of Cr6+

A

Orange

29
Q

How can Fe(OH)2 be oxidised?

A

Having it stood in air it goes to Fe(OH)3

Chemistry (9 decks)

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