Title	: SEPARATING MIXTURES 

Aim	: To separate a mixture of sand and salt .

Directions : Place two spatula measures of the sand-salt mixture 
in a beaker  and add 50 ml of water . Stir thoroughly . Fold the 
filter paper into a cone and place inside the funnel . Moisten the 
paper so that it sticks to the side of the funnel . Carefully add 
the suspension and allow all the liquid to pass through . Rinse the 
residue with some more water . Remove the paper , unfold and spread 
out to allow the residue to join . Place the filtrate over a flame 
and heat until a small volume of filtrate is left . Place this in 
the evaporating dish and heat over a water bath until only salt 
crystals are left . 

Discussion   : 
What are the processes involved in the separation ?
Why is the salt crystallized using a water bath ?
Why was the residue washed before removing ?
Are there any other method(s) that could be used to separate the sand 
and salt ?

Criteria    : MANIPULATION 

a) filtering 
folding the paper correctly 
not over pouring during the process 
appearance of filtrate 

b) using the measuring cylinder
keeping the cylinder on a flat surface 
reading at eye level
reading the bottom of the meniscus

c) using the Bunsen 
closing the air hole during lighting 
lighting the match before turning on the gas 
adjustment of flame during use 

d) evaporating 
control of the process , not allowing total dryness