303 
mmm 
Substance Concentration Ke 
Oxalic acid 20 ION 029 
” 310-4 N 0:56 
5 310-5 N 0:90 
Benzoic acid LA><10-3 0°25 
5 2104 058 
= 5 X 10-5 0°83 
Cacodylic acid 02 N 0°75 
» ‘O1 _N 0:94 
Sodium benzoate 1X 10-3 0:19 
ze 07> 10-3 0:25 
- 15.< 10-4 0-70 
5 1D 10-5 0-90 
Potassium oxalate 1x 10-3 N 0°29 
5 VO IOA IN 0:80 
pe 2 10-5 0:96 
Sodium salicylate 1 >< 10-3 0:23 
" 15 XX 10-4 0°73 
” 1 >< 10-5 095 
Sodium citrate 1 x 10-3 0:14 
pd 1X 10-5 0:85 
Sodium acetate 3 103 0:73 
Fe tlie 0°85 
Sodium propionate 3>< 10-4 0:74 
» 1X 10-3 0 89 
Sodium butyrate 3X10 3 0:74 
a 1 >< 1053 0°85 
erature coefficient is about 2 (between 25°-—40°) and it does not 
appreciably change in presence of hydroquinone (Duar, Proc. Akad, 
Wet. Arnsterdam 1919, 21, 1042). It has been found that so long 
as about one third of the substance is oxidised, the unimolecular 
velocity coefficient remains practically constant, but as the oxidation 
proceeds further, the velocity coefficient increases rapidly, and hence 
