FLAME TESTS Flashcards

1
Q

explain the process of preparing and doing a flame test

A

pass the nichrome wire through a bunsen burner
add the sample to nichrome wire
pass through the blue flame on a bunsen
the color of the flame can be used to work out the metal ion present

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2
Q

Lithium (Li+)

A

crimson red

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3
Q

Sodium (Na+)

A

yellow

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4
Q

Potassium (K+)

A

lilac

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5
Q

Calcium (Ca+)

A

orangey red

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6
Q

Copper ion

A

green

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7
Q

problems with using flame tests

A
  • the color of the flame test can be difficult to distinguish if there is a low concentration of the metal ion
  • if the sample contains a mixture of metal ions it can mask the color of the flame
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8
Q

explain the process of flame emission spectroscopy

A
  • a sample of the metal ion in solution is placed into a flame
  • the light given out is passed into a spectroscope
  • which converts the light into a line spectrum
  • THE POSITIONS OF THE SPECTRUM ARE SPECIFIC FOR THE GIVEN METAL ION AND CAN TELL YOU THE CONCENTRATION OF A METAL ION (the lines become more intense at a higher concentration)
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9
Q

what type of method is flame emission spectroscopy an example of

A

instrumental method

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10
Q

3 advantages to instrumental methods

A
  • rapid (analyse samples more quickly)
  • sensitive ( flame emission spectroscopy will work even on a tiny sample of a metal compound)
  • accurate (flame emission spectroscopy is more likely to identify a metal ion correctly than a flame test)
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