IOWA ACADEMY OP SCIENCE 
145 
TABLE VIII.— VELOCITY COEFFICIENTS. 0.0125N AgNOa AND 0.05N CaHel. 
100 % Ethyl Alcohol 
50% Ethyl Alcohol 
£ 0 % Methyl Alcohol 
100% Methyl Alcohol 
t 
c 
^ k 
t 
c 
k 
t 
C 
k 
0 
5. 
0 
5. 
0 
5. 
4 
4.05 
'’T 6027 O 
4 
3.92 
.00313 
4 
3.67 
.00438 
7 
3.64 
.00235 
7 
3.395 
.00289 
8 
2.645 
.00426 
10 
3.14 
.00254 
10 
: 2.795 
.00310 
13 
1.85 
.00422 
17.14 
2.34 
.00240 
17 
1.975 
.00300 
16 
1.505 
.00420 
28 
1.585 
.002?9 
23 
1.52 
.00290 
20.5 
1.20 
.00306 
35.5 
1.26 
.00220 
30 
1.09 
.00290 
24 
.91 
.00410 
68 
.42 
.00236 
37 
.835 
.00280 
28 
.78 
.00386 
45 
.59 
.00280 
32 
.615 
1 
.00385 
TABLE IX.— VELOCITY COEFFICIENTS. 0.0125N AgNOa AND 0.025N C 2 H 5 I. 
100% Ethyl Alcohol 
50% Ethyl Alcohol 
50% Methyl Alcohol 
100% Methyl Alcohol 
t 
c 
k 
! 
t 
c 
k 
t 
C 
0 
5. 
0 
5. 
0 
5. 
10 
3.865 
”roo27r ' 
6 
4.17 
.00380 
6 
4.015 
.00463 
19.08 
3.175 
.00265 
10.5 
3.72 
.00302 
10 
3.28 
i .00466 
30 
2.65 
.00248 
15 
3.27 
.00813 
15 
2.705 
.00472 
45 
1.88 
.00268 
25 
2.66 
.00314 
25 
1.98 
' .00453 
60 
1.56 
: .00248 . 
35 
2.08 
.00304 
33 
1.61 
i .00466 
80 
1.06 
.00264 
45 
1.67 
.00307 
42 
1.265 
^ .00432 
130 
.425 
.00285 
60 
1.30 
.00295 
51 
.98 
.00437 
160 
.225 
.00306 
80 
.89 
.00299 
60 
.77 
.00440 
.In order to make certain that no changes were taking place in the apparatus 
solutions, or methods during the investigation, a check experiment was carried 
out with the results as shown in Table X. It is clearly seen that after nearly 
three months this data could be reproduced quite accurately. 
TABLE X.— VELOCITY COEFFICIENTS. 0.025N AgNOa AND 0.O25N C 2 H 5 I. 
Average of two experiments 
January 15. 
L 
Solvent: Ethyl Alcohol 
A single experiment (Check) 
April 12 . 
t 
c 
k 
t 
c 
k 
0 
10 . 
0 ! 
. . 
10 . 
9 
7.495 
.00371 
9 ■ 
7.48 
' .00374 
18 
6 .O 06 
.00362 
18 i 
6.04 
.00364 
30 
4.97 
.00357 
30 1 
4.95 
! .00340 
50 
3.785 
.00328 
50 i 
3.80 
1 .00326 
75 
2.86 
.00334 
75 i 
2.87 
.00331 
110 
2.12 
.00338 
110 
2.16 
i .00330 
A tabulation of the mean velocity coefficients. Table XI, gives a general sur- 
vey of the work covered, and may serve to bring out more clearly some of the 
points already noted. A natural order of tabulation readily shows the increase 
of the velocity coefficients with increasing initial concentration of silver nitrate. 
Taking any given concentration of ethyl iodide, e.g. 0.0125N, the change in the 
10 
