Fractional Crystallization 1 Purpose: The purpose of this experiment is to quantitatively separate a mixture of sand, potassium nitrate (KNO 3), and copper sulfate pentahydrate (CuSO 4 · 5 H 2O) based on their solubilities. Please Read:
A. Separation of mixtures Through a microscope you can see the difference between sand and salt. Salt crystals are cubic and sand grains are rounded oblong grains. If you had a small enough tweezers and microscope you could separate the salt from the sand one by .