Preparation of Antimony III Iodide

Preparation of Antimony(III) Iodide. (Perform the experiment in the presence o/ your instructor in a iume cupboard, away from a flame ) Assemble an apparatus (see Fig. 119a). Place 1 g of finely triturated metallic antimony into a three-neck flask and add 25 ml of benzene. Prepare a solution of 4 g of iodine in 75 ml of benzene and pour it into dropping funnel 4. Heat the mixture in flask 1 in a water bath with stirring until it boils (use an electrical stove with an enclosed coil ). 

Drop in the iodine solution from dropping funnel 4 while heating. Continue the heating for another 1-1.5 hours up to complete dissolution of the antimony. Let the solution stand overnight in the apparatus and on the following day filter off the crystals of antimony (III) iodide. If no crystals precipitated and unreacted antimony remains, heat the solution and filter it while hot through a paper filter on a funnel for hot filtration. 

Evaporate the solution (in a fume cupboard, away from a flame ) on a water bath until a film appears. Cool the solution to room temperature. Filter off the formed crystals using a glass filter No. 3. 

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The furnace is subjected to a temperature/time treatment according to the specifications given in the tables for the respective compound. For the preparation of antimony(III) iodide sulfide, the furnace is cooled uniformly from 480-250°C. for a period of 10 days. ... 

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