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AQA FURTHER CHEMISTRY > Test for positive ions > Flashcards

Test for positive ions Flashcards

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1
Q

What does flame tests identify?

A

Metal ions

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2
Q

How do you test for various metal ions?

A

Putting a substance in a flame and seeing what colour the flame goes

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3
Q

What colour does lithium go?

A

Crimson

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4
Q

What metal ion is it if the flame turns crimson?

A

Lithium

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5
Q

What colour does sodium go?

A

Yellow

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6
Q

What metal ion is it if the flame turns yellow?

A

Sodium

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7
Q

What colour does potassium go?

A

Lilac

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8
Q

What metal ion is it if the flame turns lilac?

A

Potassium

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9
Q

What colour does calcium go?

A

Red

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10
Q

What metal ion is it if the flame turns red?

A

Calcium

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11
Q

What colour does barium go?

A

Green

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12
Q

What metal ion is it if the flame turns green?

A

Barium

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13
Q

How do you carry out a flame test?

A

Dip wire in hydrochloric acid and rinse with distilled water
Dip a clean wire loop into the sample of compound
Put the wire in the Blue flame

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14
Q

What are many metal hydroxides?

A

Insoluble

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15
Q

What do some metal ions form with NaOH?

A

Coloured precipitate

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16
Q

How can you test metal ions for a precipitate?

A

Add a few drops of sodium hydroxide to a solution of your compound

17
Q

What colour precipitate is Calcium?

A

White

18
Q

What metal forms a white precipitate?

A

Calcium
Magnesium
Aluminium - at first

19
Q

What colour precipitate is copper?

A

Blue

20
Q

What metal forms a blue precipitate?

A

Copper

21
Q

What colour precipitate is Iron(II)?

A

Green

22
Q

What metal produces a green precipitate?

A

Iron(II)

23
Q

What colour precipitate is iron(III)?

A

Brown

24
Q

What metal produces a brown precipitate?

A

Iron(III)

25
Q

What colour precipitate is aluminium?

A

White at first but redissolves in excess NaOH to form a colourless solution

26
Q

What colour precipitate is magnesium?

A

White

AQA FURTHER CHEMISTRY (20 decks)

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