256 Wisconsin Academy of Sciences, Arts and Letters. 
Experiments were also tried in which the theoretical amount 
of KI was taken, and in addition a certain amount of some 
foreign salt. It. was found that if a comparatively large 
amount of Ha Cl was added to the electrolyte, the yield of 
OIIX 3 approached more nearly to the theoretical yield. Small 
amounts of Ha Cl seemed to have but very little effect. The 
addition of an amount of K Cl 0 3 equal to the calculated 
amount of KI also caused an increase in the yield. 
Plate XIII shows some efficiency curves obtained by plotting 
grams of ingredients along the X axis, and per cent efficiency 
along the Y axis. Curve Ho. 1 is an alcohol efficiency curve, 
and by alcohol efficiency is meant the ratio of the total amount 
of alcohol actually converted into iodoform to the total amount 
added to the electrolyte. Curve Ho. 2 represents the current 
efficiency and lastly, curve Ho. 3 represents what may be 
termed a chemical efficiency curve, that is, the ratio of the 
amount of CHI 3 obtained to the amount our equations (A) 
fells us we ought to get if all went ideally. These curves show 
;that a reasonably quantitative reaction for alcohol may he ob¬ 
tained only at the sacrifice of very low current and chemical 
^efficiencies* 
The highest chemical efficiency obtained was about 91 per 
"cent; the greatest current efficiency 34 per cent, and the best 
alcohol efficiency 54 per cent. To obtain a current efficiency 
higher than 37.5 per cent would require a radical change in 
the chemistry of the process. 
Data: Curves on sheet No. 1. 
Trials. 
Hours. 
Current. 
Ampere 
hours. 
Grams 
CHI 3 
Current 
efficieney. 
1 
1 
0.5 amp. 
0.5 
0.6505 
P9r cent 
26.6 
2 
2 
“ 
1.0 
1.2505 
25.63 
3 
3 
“ 
15 
2.309 
31.50 
4 
4 
“ 
2.0 
2.8072 
28.75 
5 
4 
t 4 
2.0 
2.8583 
29.6 
6 
5 
4 ‘ 
2.5 
2.5295 
20.95 
