1. Identifying the
Cations and Anions
in an Ionic salt
Cations (p 153; 27)
Use aq NaOH and aq. NH3
observe the colour differences
of the precipitates obtained
Anions (p. 156; 29-31)
Use dil HCl, aq AgNO3, aq
BaCl or other types of
solutions to identify the anions
by observing the
- colour of precipitate
- gases produced

2. Other ways to
identify the salt
Appearance
& Colour of salt (p 17-19)
Different ionic salt appear
differently
For e.g, Group 1 salts usually
appear colourless
While a fine green powder
usually means it is copper(II)
carbonate
It’s solubility also indicates
possible identity

3. NOW…
Using heat to
identify ….
Observe
 Test the gas produced
 The colour of the salt before it
is heated
 the colour of the residue after
heating

4. Identify this salt
Dark green powder
does not dissolve in water
gives a light blue ppt in XS aq
NaOH
when heated, gas turns
limewater chalky and colour of
residue is black
What is it?