A Separation and Purification Scheme

Extraction Crystallization Devising a procedure Critical thinking application 

Crystallization Purification of Solids Extractions, Separations, and Drying Agents 

Dispose of all filtrates that may contain 1,4-dibromobenzene or methylene chloride into the container designated for halogenated organic wastes. All other filtrates may be disposed of into the container for nonhalogenated organic wastes. 

Students must be told the composition of their mixture well in advance of the laboratory period so that they have enough time to devise a procedure. It is advisable to require that students turn in a copy of their procedure at the beginning of the lab period. You may wish to allow enough time for students to repeat the experiment if their procedure doesn t work the first time or if they want to improve on their percentage recovery and purity. If you allow enough time for students to perform this experiment just once, it will be helpful to put out pure samples of the compounds in 

Experiment 5 is based on a similar experiment developed by James Patterson, North Seattle Community College, Seattle. 

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The choice of a separation and purification scheme depends on the nature of the californium source, the particular isotopes of californium involved, the amount of material, the impurities present, as well as several other factors. In short, the procedure should be customized to the particular needs at hand. Usually ion exchange is involved either as the main separative technique or in some secondary... 

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