36. Note on the Interaction of Hydrazines with 
erri-cyanides. 
By Prryaparansan Ray and HEMENDRA Kumar SEN. 
The oxidation of hydrazine has been elaborately studied 
by Browne and Shetterly (cf. Journal Am. Chem. Soc. 3/, 
(1909) , p. 783), from the standpoint of the formation of ammonia 
and hydronitric acid. They have pronounced the reaction 
between iodic acid and hydrazine as the only instance where 
it is free from any side disturbances. According to their sug- 
gestion Hale and Redfield (Jl. Am. Ch. Soc., 33, (1911), 
p- 1353), have evaluated hydrazine by this method, confirming 
the work of Rimini (cf. Atti. Acad. Lincei [5], 15, II, p. 320). 
itee 
volume of nitrogen collected gives the measure of hydrazine 
according to the simple oxidation formula :— 
N.H, + 0,=N, + 2H,0. 
The most far-reaching effect, however, of the above Te- 
action is the reverse evaluation of ferri-cyanides. The reaction 
proceeds according to the following equation :— 
4K.Fe(CN), + 4KOH + N,H,= N, + 4K,Fe(CN), + 4H;0. 
It has a decided advantage over the permanganate process 
in so far as the end point in the latter case can rarely be 
correctly hit off, not to speak of the unusually long time 
required to finish the whole operation. 
