CHEM 235 Chapter Notes -Separatory Funnel, Stopcock, Miscibility

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24 Nov 2012
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Liquid-liquid extraction- used for separating mixture where components of mixture can be liquid or solid: separation is based on difference in solubility of the two immiscible solvents. Mixture is dissolved or suspended in 1st solvent and then 2nd solvent is introduced to solution. Using separatory funnel to shake solvent, one component of mixture will transfer to second solvent and using evaporation after, components would be separated. Partition coefficient of extraction- compound that is attempted to extract with second solvent, although it"s much more soluble in 2nd solvent than in 1st, still has ability to dissolve in 1st solvent. There must be unequal distribution of components of mixture between 2 distinct phases: with correct choice of phases, factional separation can be accomplished. Separatory funnel has stopcock with 4 removable pieces (see page 2-3: use caution when cleaning these pieces of apparatus because extremely fragile.

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