( 98 ) 



ions (capacity 150 cc); a few experiments were made witli a larger 

 pattern (capacity 450 cc.) As solvent a mixture of metliylalcoliol and 

 water was used of three different concentrations. 



As electrolyte, cupricliloride was first used; when this substance 

 appeared to be unsuitable for the purpose (owin^ to formation of 

 cuprouschloride) silvernitrate was taken. This salt was sufficiently 

 soluble in the düuted metliylalcoliol and did not seem to affect it 

 during the electrolysis. The electrodes were made of silver, the cathode 

 was placed in the uppermost limb of the apparatus and the anode, 

 around ^vllic•ll the increase of concentration of the silvernitrate takes 

 place, in the other. After placing the apparatus in the waterbath a 

 current of 70 volts was passed for 3 to 4 hours; the strength of 

 the current was determined by means of a milli-ampère-meter. 



Separate experiments had shown that the metliylalcoliol could 

 be very accurately determined by distillation. The liquid to be ana- 

 lysed (25 cc. of the cathode- and anode solutions) was mixed with 

 25 cc. of water and of this mixture 25 cc. were very carefully 

 redistilled into a weighed measuring flask. The amount of silver- 

 nitrate was found by titration and the silver deposited on the cathode 

 was weighed. From the follo\ving particulars of the experiments, we 

 may draw the conclusion that under the circumstances of the expe- 

 riments there is no question of a transference of the solvent along 

 with one of the ions. 



It was found previously that on dissolving AgNO, in dilute 

 metliylalcoliol the volume of the liquid is scarcely affected. 

 Metliylalcoliol of 25 pCt. by weight. 



Weight of measuring flask after distillation from solvent 36.838 



*& 



// // // ;/ // /, solution n.AgNOs 33379 



I. Meth. ale. of 25 pCt. by weight. Small apparat. Curr. 0.36 amperes. 

 Time: SV'^ hours. Silver on the cathode: 4.50 grams. 



Cone. AgNOs before the experiment: normal. 



» ^T^ r. i anode 1.30 normal 



Cone. Ag NO, after „ „ , ^^^^^^^j^ ^ g^ _^ 



_ - „ , T -n ( solution at anode 36.876 



Weight of measuring flask alter the distill. . , op orrK 



^ ° ( ir II cathode. 36.875 



II. Meth. ale. 35pCt. by weight. Large apparatus. Current 0.32 ampere. 

 Time : 4 hours. Silver at cathode : 4.1 grams. 



