Preparation of Zinc Iodide in Absolute Ether

Preparation of Zinc Iodide in Absolute Ether. Assemble an apparatus (see Fig. 119a), replacing dropping funnel 4 with a glass stopper provided with a ground-glass joint. Put 3 g of powdered zinc, 

5 g of freshly sublimed iodine, and 50 ml of absolute ether into flask 1. 

Heat the flask until the reaction mixture boils (use an electric stove with an enclosed coil and insulate the stove surface from the flask with a piece of asbestos ). After the complete disappearance of the iodine colour (in 2-2.5 h), pour the solution into a round-bottomed flask provided with a gas-discharge tube having a stopcock (see Fig. 119b). Connect the flask via a cooled receiver to a water-jet pump, distil off the major part of the ether at room temperature, after which carefully heat the flask in a sand bath. Transfer the substance into a weighed weighing bottle. Weigh it and calculate the yield in per cent. 

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Preparation of Zinc Iodide in Absolute Ether (262). 8. Preparation of Zinc Oxyacetate (262). 9. Preparation of Crystalline Cadmium Sulphide (263). 10. Preparation of Autocomplex Cadmium Iodide ( 3). 11. Preparation of Cadmium Pigments (263). 

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