( “291 j 
Acide diéthylphosphorique. 
Solution VcS normale. 
pour t — 0, w = 35°50, a = 33°50 h- 10°35 = 44°05. 
Temps 
en 
minutes. 
,w = déviation observée. 
Moyenne. 
i a 
log- 
a — x 
k. 
120 
30.03 
30.06 
30.07 
30.05 
354.2 
2.954 
210 
27.63 
27.62 
27.64 
27.63 
624 
2.957 
360 
24.02 , 
23.98 
23.95 
23.98 
4057.5 
2.936 
455 
24.70 
21.72 
24.72 
24.74 
4352.6 
2.972 
540 
49.90 
49.88 
4990 
4990 
4603.2 
2.969 
720 
46 32 
46.30 
46.30 
46.30 
2449.8 
2.984 
4440 
6.00 
6.04 
6.00 
6.00 
4254.6 
2.952 
4620 
4.07 
4.06 
4.05 
4.06 
4792.9 
2.958 
1935 
4.28 
4.25 
4.26 
4.26 
5717.3 
2.954 
2880 
-4.30 
- 4.28 
-4.26 
-4.28 
8465.0 
2.940 
00 
-10.55 
D’o 
ù k moyen = 
= 2.957 
