1346 
Evidentlj light markedlj accelerates the action of iodine on nitrite 
Solutions. 
It has also been observed that in presence of liglit the action of 
iodine on hj^drazine bjdrochloride and bydroxjlamine hydrocliloride, 
is decidedly more rapid tlian in darkness. (See table p. 1344.) 
The oxidation of hypophospliorons acid by Iodine has been inves- 
tigated by various workers. Rüpp and Finck (Arch. Phann. 1902, 
240, 663) propose for the estiinalion of hypopbosphorons acid a 
method whicb is based on the fact that in acid solution the hypo- 
phosphorons acid is oxidized to phosphorous acid. Steele (Trans. 
Hypophosphorous acid and iodine. At 28°. 
Quality of light 
1 Time of 
! reaction 
t 
Amount of 
iodine added 
Unchanged 
iodine 
Volume of solution 
1) Sunlight 
150' 
0.03175 
0.02475 
1 50 c.c. ^ (factor 0.852) 
hypophosphorous acid 
Darkness 
150' 
Do 
0.02934 
f and 2.5 c.c. iodine. 
2) Sunlight 
250' 
Do 
0.01396 
Do 
Darkness 
250' 
Do 
0.01612 
i 
3) Diffused light 
160' 
Do 
0.02689 
Do 
Darkness 
160' 
Do 
0.02912 
( 
4) Diffused light 
260' 
Do 
0.01425 
Do 
Darkness 
260' 
' Do 
0.01587 
1 
Sodium hypophosphite and iodine. 
At 28°. 
1) Sunlight 
140' 
0.03175 
0.01028 
N 
j50 c.c. salt solution 
(factor 0.984) and 2.5 c.c. 
Darkness 
140' 
Do 
0.01385 
1 /V . 
1 iodine. 
2) Sunlight 
240' 
Do . 
0.00268 
(75 c.c. ~ (factor 0.984) 
Darkness 
240' 
Do 
0.00360 
i N 
land 2.5 c.c. iodine. 
3) Diffused light 
150' 
Do 
0.01175 1 
I50 c.c. ^ (factor 0.984) 
Darkness 
150' 
Do 
0.01378 
i N 
[and 2.5 c.c. iodine. 
4) Diffused light 
245' 
Do 
0.00308 
n5 c.c. ^ (factor 0.984) 
Darkness 
245' 
Do ! 
0.00356 
N 
land 2.5 c.c. y-Q iodine. 
