Thursday, March 12, 2009  Latest update: Experiment 17  Exp 17
Topic: Technique - synthesis  Purpose: to determine the
percetage of aluminium in a sample X by means of the preparation
of a complex compoun dof aluminium wiht 8-hydroxyquinoline.
Let's assume that the result of step (a) obtained as below:
mass of container + KA3/ g = x mass of empty container/ g = y
mass of KA3/ g = x-y = z   Let's the result of step (b) as
below:  mass of crucible + precipitate/ g = a mass of empty
crucible/g = b mass of precipitate/g = a - b = c  (c) (i) to
maximised the collision between particles and thus ensures a
complete reation (ii) to remove impurities and excess ions. Cold
water ensures that no precipitate will dissolve and be washed
away because water with low temperature will not dissove the
precipitate.  (d) the complex precipitate obtained is dried and
weight a few times in the oven until the weight of the complex
precipitate obtained is constant.  (e) Mass of 1 mole of complex
compound with formula Al(C9H6NO)3