test for cations Flashcards
1
Q
lithium flame
A
crimson
2
Q
sodium flame
A
yellow
3
Q
potassium flame
A
lilac
4
Q
calcium flame
A
orange-red
5
Q
copper flame
A
green
6
Q
calcium with NaOH
A
white
7
Q
copper with NaOH
A
Blue
8
Q
iron (2+) with NaOH
A
green
9
Q
iron (3+) with NaOH
A
brown
10
Q
aluminium with NaOH
A
white at first but then redissolves in excess NaOH to form a colourless solution
11
Q
magnesium in NaOH
A
white
12
Q
describe flame emission spectroscopy
A
- a sample containing ions is placed in the flame
- causes them to heat up and transfer light energy
- light passes through spectroscope
- it can detect different wavelengths of light to produce a light spectrum
- different ions emit different wavelengths so each ion has a different pattern of wavelengths
- so each ion has a different line spectrum
