. American chemical journal . —The cathode solution first used was pre-pared by mixing 5 grams of cacodyl chloride, 90 grams offormic acid, and 8 grams of alcohol; its specific gravity An anode solution of the same specific gravity wasprepared from sulphuric acid. After sufficient anode solu-tion and II cc. of cathode solution were run into the reduc-tion cell and all the parts of the apparatus were adjusted, acurrent of 5 to 6 volts and o. 5 to o. 6 ampere was turned on. Thecathode solution clouded almost immediately and after 500 » Ber. d. chem. Ges., 27, 1378.* This Journal, 36, 3.
. American chemical journal . —The cathode solution first used was pre-pared by mixing 5 grams of cacodyl chloride, 90 grams offormic acid, and 8 grams of alcohol; its specific gravity An anode solution of the same specific gravity wasprepared from sulphuric acid. After sufficient anode solu-tion and II cc. of cathode solution were run into the reduc-tion cell and all the parts of the apparatus were adjusted, acurrent of 5 to 6 volts and o. 5 to o. 6 ampere was turned on. Thecathode solution clouded almost immediately and after 500 » Ber. d. chem. Ges., 27, 1378.* This Journal, 36, 3. 98 Dehn. cc. of electrolytic hydrogen had been evolved in the voltameter,a heavy oil was found to have separated in the cell and aspontaneously inflammable gas began to be evolved with thecathode hydrogen—this gas increased in concentration duringthe remainder of the reduction. The oil, insoluble in formicacid, was identified as cacodyl; the gas was found to be di-methylarsine; hence the above equations are Fig. III. A Hofmann U-tube placed in series with the cell and used as a hydrogen volta-meter. The reduction cell, made of glass. Apparatus used to measvu-e the gas evolved at the cathode and subsequentlyto deUver into Hem pel burettes (at point k). The following experiment was undertaken for the purposeof determining the relative rates of reduction of cacodyl chlor-ide to cacodyl, and of the latter to dimethylarsine: The cathode solution was prepared by dissolving 9. i gramsof cacodyl chloride in a mixture of 90 cc. of alcohol and 25 hydrochloric acid (sp. gr. ); one fifth of this solutionand a current of 5 to 6 volts and i. 05 to i. 20 amperes wereused for the reduction. When exactly 50 cc. of hydrogen had Reactions of the Arsines. 99 been evolved in the voltameter (II.), the current was turnedoff and the volume of mixed gases (III.) evolved from thecathode solution was measured in the apparatus C; the gaswas next drawn over into a Hempel burett
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