Preparation of Lithium Iodide

Rapidly pour over the solution into a round-bottomed flask and close it with dark paper (the solution turns yellow in the light). Connect the flask to a water-jet pump via an empty trap and drying columns with a granulated alkali (see Fig. 1196, p. 196). 

Distil oS the major part of the ether in the vacuum produced by the pump at room temperature, and then at 40 °C (in a water bath). 

Transfer the white or slightly yellow salt into a weighed weighing bottle and weigh the product. Calculate the yield in per cent. 

What will happen if the ether solution is cooled to —20 °C without evaporation in a vacuum  

Preparation of Potassium Hydroxide by the Electrolysis of a Potassium Chloride Solution. Assemble an electrolyzer (see Fig. 130, p. 231). Place small cylinder 2 (8 cm in height and 4 cm in diameter) made from uncalcined clay into 0.5-litre thick-walled beaker 1. Pour a saturated potassium chloride solution into both vessels so that the level of the liquid in them will be the same. Add a few drops of phenolphthalein to the electrolyte. Use carbon rod 4 as the anode and thick iron wire 3 as the cathode. Secure both electrodes with corks in the electrolyzer lid. A d-c source at 10 V is needed for the experiment. After assembling the electrolyzer, switch on the current. What happens in the anode and cathode compartments Write the equations of the reactions. What substances can form in the absence of a diaphragm  

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