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flame tests Flashcards

(9 cards)

1
Q

method FT

A

small amount of chemical put on wire mounted in a handle
end placed in blue bunsen burner flame
colour of flame used to work out metal ion present

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2
Q

lithium

A

crimson flame

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3
Q

sodium

A

yellow

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4
Q

potassium

A

lilac

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5
Q

calcium

A

orange/red

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6
Q

copper

A

green

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7
Q

problems with using flame tests

A

colour can be difficult to distinguish
- esp. if theres a low conc of metal compound
sample could contain mixture of metal ions
- mask colour of flame

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8
Q

flame emission spectroscopy

A

sample of ion placed into flame
light given out passed into spectroscope machine
converts line into line spectrum
pos of line in spectrum is used to identify ion present
- positions are specific for metal ions

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9
Q

advtgs of instrumental methods

A

rapid
senstive ( work with a tiny sample)
accurate
FES can also show conc of metal ion
- lines are more intense at a higher conc§

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