Chemistry itself knows altogether too well that - given the real fear that the scarcity of global resources and energy might threaten the unity of mankind - chemistry is in a position to make a contribution towards securing a true peace on earth.
~Kenichi Fukui

Saturday, 2 February 2013

Practical - Crystallisation

In this experiment, we purified copper (II) sulfate crystals by using 2 methods of cooling, namely rapid cooling and slow cooling.

Process of the experiment:

Dissolving copper (II) sulphate in boiling water

Heating the copper (II) sulphate solution in an evaporating dish

Obtaining crystals by rapid cooling


Crystals obtained by rapid cooling:


Observation: Crystals obtained are very fine and powdery.

Crystals obtained by slow cooling:


Observation: Crystals obtained are large with more regular shapes.


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