IOWA ACADEMY OP SCIENCE 
143 
It will be noted that, other conditions being the same, a change in the 
initial concentration of the silver nitrate (Tables IV, VII, and VIII) produces 
a much greater change in the velocity coefficients than does a similar change 
in the initial concentration of the ethyl iodide (Tables IV, V, VI.) 
A comparison of Tables VI and VIII, using the most concentrated solution 
of the silver nitrate with the weakest concentration of the ethyh iodide, and visa 
versa, shows that the reaction in the former proceeds much more rapidly than 
that in the latter, the same amount of silver nitrate being used up in one-third 
to one-fourth the time required by the corresponding reactions in Table VIII. 
According to the law of mass action, the velocity of a bimolecular reaction 
should be directly proportional to the product of the reacting masses. That 
other influences than those due to concentration of the reacting substances are 
at work may be seen by a comparison of Tables VI and VIII. The values of k 
representing the- proportionality between velocities land the products of the 
active masses vary widely for each solvent. 
TABLE III.— VELOCITY COEB'PICIENTS. 0.0125N AgNOa AND 0.0125N C2H5I 
IN ALCOHOLS AS SOLVENTS. 
100% 
Ethyl Alcohol 
75% Ethyl. Alcohol 
25% Methyl Alcohol 
50% Ethyl Alcohol 
50% Methyl Alcohol 
t 
c 
■k 
t 
c 
k 
t 
c 
k 
0 
5. 
0 
5. 
0 
5. 
11 
4.06 
"VooiH"'- 
10 
4.46 
.00242 
10 
4.205 
.00378 
21 
5.82 
.00294 
23 
3.88 
.00251 
22 
3.675 
.00328 
45 
5.25 
.00245 
31 
3.61 
.00248 
31.1 
3.30 
.00331 
70 
2.735 
.00237 
45 
3.26 
.00257 
45 
2.85 
.00335 
110 
2.09 
.00260 
65.5 
2.81 
.00238 
65.5 
2.39 
.00833 
135 
1.695 
.00290 
85 
2.53 
.00229 
85 
2.14 
.00315 
170 
1.55 
.00262 
110 
2.20 
,^J0251 
110 
1.835 
.00314 
130 
2.00 
.00231 
130 
1.64 
.00315 
25% Ethyl Alcohol 
75% Methyl Alcohol 
100% Methyl Alcohol 
t 
1 
« ! 
t 
C 
k 
0 
5. 
0 
5. 
10 
4.125 
.00424 
5 
4.31 
.00640 
23 
3.495 
.00374 
10 
3.90 
.00564 
31 
3.12 
.00389 
25 
2.965 
.00549 
45 
2.695 
.00380 
40 
2.42 
.00533 
65.5 
2.235 
.00378 
60 
1.945 
.00524 
89 
1.95 
.00368 
90 
1.49 
.00524 
110 
1.66 
.00366 
120 
1.16 
.00552 
150 
1.50 
.00359 
