flame tests

Question 1

method FT

Answer 1

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

Question 2

lithium

Answer 2

crimson flame

Question 3

sodium

Answer 3

yellow

Question 4

potassium

Answer 4

lilac

Question 5

calcium

Answer 5

orange/red

Question 6

copper

Answer 6

green

Question 7

problems with using flame tests

Answer 7

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

Question 8

flame emission spectroscopy

Answer 8

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

Question 9

advtgs of instrumental methods

Answer 9

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