Some Reactions of Acetylene (Paperback)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ELECTROLYSIS OF ZINC CHLORIDE SOLUTION WITH CALCIUM CARBIDE ELECTRODES. Zinc chloride was electrolyzed under similar conditions as already described in the electrolysis of calcium chloride. The salt was prepared from arsenic-free zinc with dilute hydrochloric acid. The apparatus was of the type shown in figure (4)- After the solution had been evaporated to concentration, it was used as an electrolyte both at ordinary temperatures and above 100 C. The solution was in one of these operations boiled while the current was passed through it. In the first experiment the anode was a piece of calcium carbide and a zinc rod was used as a cathode. An electromotive force of 20 volts was applied, and this gave a varying current of strength ranging as follows; (.1 amp., .6, 6.5, 4.5, 5, 5-5-6, 6.5, 6.6, 6.8, 7.5, 7.3, 7.6, and finally 8 amperes ) After the operation the calcium carbide was covered with grains of carbon. No explosion was noticed. A deposit of crystalline zinc took place on the cathode of platinum. When calcium carbide was used as a cathode in an electrolyte of zinc chloride, no ethylene was obtained. In the third experiment performed with a calcium carbide cathode, and a zinc anode, the carbide became covered with large crystals of zinc The solution of zinc chloride was acidified before the electrolysis, but most of the acid was driven off by the heat of the operation. In the first experiment no gas was collected. The object of the operation was to find whether chlorineexploded with nascent acetylene at the anode. It was found that the chlorine united with the calcium of the carbide, while the carbon was separated in a hard gritty mass. Little or no free chlorine was noticed. The temperature of this operation ranged from 124 C. to 132 C. No reason has been found for...