1344 
Glycollate acid and iodine. 
Quality of light 
Time of 
exposure 
Amount of 
iodine added 
! Unchanged 
' iodine 
Volume of Solution 
1) Sunlight 
250' 
0.00635 
0.00415 
1 50 c.c. ^ glycollic acid and 
Darkness 
250' 
Do 
0.00542 
1 5 c.c. ^ iodine. 
2) Sunlight 
420' 
[ Do 
0.00224 
j Do 
Darkness 
420' 
1 Do 
0.00352 
3) Diffused light 
480' 
Do 
0.00217 
! Do 
Darkness 
480' 
Do 
0.00275 
4) Diffused light 
560' 
Do 
0.00185 
Do 
Darkness 
560' 
Do 
1 
0.00232 
i 
Krom the foregoing tables it will be seen that the action of iodiiie 
is more rapid with the salts thaii with the acids. Hence it maj' be 
inferred that iodine acts on the negative organic radieals (i.e. formate 
ion, malale ion, etc.). Moreover the “Reciprocitj- Law” holds good 
Concentration of nitrite solution 2 N (0.991 factor). 
Quality of light : 
Time of i 
exposure i 
Amount of 
iodine added 
Unchanged 
iodine ' 
Volume of solution 
1) Sunlight 
30' 
0.0635 
0.00128 
1 50 c.c. Sodium nitrite and 
Darkness 
30' 
0.0635 
0.03469 
) 5 c.c. iodine. 
2) Sunlight 
125' 
0.1270 
0.00642 
) 50 c.c. Sodium nitrite and 
Darkness 
125' 
0.1270 
0.06832 
1 TV 
) 10 c.c. — iodine. 
3) Sunlight 
280' 
.01905 
0.01135 
1 50 c.c. Sodium nitrite and 
Darkness 
280' 
0.1905 
0.09985 
i 15 c.c. ^ iodine. 
^ 4) Sunlicht 
25' 
0.03407 
0.00054 
1 10 c.c. Sodium nitrite and 
Darkness 
25' 
0.03407 
0.01854 
( 2^ 
j 25 c.c. iodine. 
5) Diffused light 
100' 
Do 
0.00663 
( 
Darkness 
100' 
Do 
0.01235 
j Do 
6) Diffused light 
180' 
0.0635 
0.01101 
) 50 c.c. Sodium nitrite and 
Darkness 
180' 
0.0635 
0.02195 
1 5 c.c. ^ iodine. 
7) Diffused light 
244' 
0.1270 
0.02403 
j 50 c.c. Sodium nitrite and 
Darkness 
244' 
0.1270 
0.04785 
1 2^ 
) 10 c.c. yq iodine. 
