Title	: PREPARING SALTS

Aim	: To prepare soluble and insoluble salts .

Apparatus :
beakers , funnel , filter paper , measuring cylinder , stirring rod , 
balance , Bunsen burner , tripod , wire gauze , distilled water ,
dil. sulphuric acid , barium chloride solution , iron filings , 

Directions : 
1) In a 250 ml beaker mix 50 ml dilute sulphuric acid and 50 ml barium 
chloride solution . Stir thoroughly and leave on bench for half an hour . 
Decide on a most appropriate method for separating the upper aqueous layer 
from the lower sedimentary layer .
2) In another beaker add 50 ml dilute sulphuric acid to 5g iron filings, 
stir until rate of effervescence is small . DO NOT BREATHE IN THE FUMES . 
Filter into a small beaker and wash the residue with distilled water . 
Prepare the crystals by the evaporation method .

Questions  : 
Write equations including state symbols for both reactions .
Why would the evaporation method be unsuitable for purifying the barium 
sulphate ?