94 
SIE B. C. BEODIE ON THE ACTION OF ELECTEICITY ON GASES. 
results of various experiments made under different conditions. The oxidation effected 
by the passage of the ozone was estimated as follows. 
Before the experiment a volume of the tin solution equal to that employed in it was 
run from a pipette into a measured volume of a standard solution of iodine, and the 
excess of iodine was estimated by titration with hyposulphite of soda. A similar esti- 
mation was made after the experiment with the tin solution through, which the gas had 
been passed ; the oxidation effected is measured by the difference between the two titra- 
tions. One pipette of the electrized carbonic-acid gas was employed for each experiment, 
and was passed through 10 cub. centims. of the tin solution. The experiments were 
made successively ; and no appreciable change in temperature or barometric pressure 
occurred during the course of the experiments, so that the same volume of gas was always 
operated upon. 
In the first column of the following Table the strength of the tin solution as measured 
by the volume of oxygen required to effect the complete oxidation of 1 cub. centim. of 
the solution is given. Column I. contains the “titre” of the gas, T*; column II. 
the oxidation effected in the tin solution, S ; column III. the ratio of this oxidation to 
s 
the “ titre ” of the solution, r=^- 
In experiment 5 the bulb containing the tin solution was placed in ice ; the other 
experiments were made at the temperature of the air, about 16° C. 
Experiment. 
Strength of the 
tin solution. 
I. 
T. 
II. 
S. 
III. 
S 
T' 
1 . 
15-4 
2*8 
7-59 
2-71 
2. 
15-4 
2-8 
7-87 
2-81 
3. 
4-2 
2-8 
7-9 
2-83 
4. 
4-2 
4-73 
13-56 
2-87 
5. 
4-2 
4-73 
12-77 
2-70 
6. 
0-84 
4-73 
12-66 
2-72 
Mean =2-77 
In the two following experiments, besides the oxidation effected, the diminution in 
volume also which the gas underwent by its passage through the tin solution was deter- 
mined, the diminution being estimated, as in the case of the previous experiments, with 
hyposulphite of soda. In column IV. is given the total gas unabsorbed by potash 
after the passage of the electrized gas through the solution of iodide of potassium, V. 
In column V. is given the volume of gas similarly unabsorbed after the passage of 
the electrized gas through the tin solution, Y 1 ; in VI. the difference of these volumes, 
V— V I5 being the volume of gas absorbed by the tin solution ; in VII. the ratio of this 
difference to the “ titre ” of the gas, K=^vXi. Two pipettes of gas were employed in 
these two experiments. 
* The titre and oxidation in columns I. and II. are given in terms of the cub. centims. of hyposulphite of 
soda employed for their estimation. 
