1908-9.] Hydrolysis of Salts of Amphoteric Electrolytes. 663 
Anthranilic Hydrochloride : — 
Concentration. 
Depression. 
Hydrolysis. 
K' 
•0438 N. 
•173° 
•211 
404 
•0450 
•177 
•202 
434 
•04456 
•173 
•1733 
618 
(•0490 
•187 
•139 
909) 
•0500 
•198 
•216 
336 
•05082 
•202 
•223 
307 
The values for 
lc b 
K 
obtained in this way are consistently very much higher 
even than the results of the conductivity method. For a fair comparison 
with them, the conductivity was measured at zero, and the hydrolysis 
constant calculated for that temperature. The value for M v at 25° C. 
had also to be reduced to zero, and in order to find its approximate 
coefficient the conductivity of cinchonin hydrochloride was taken at 25° and 
at 0° C. Cinchonin was chosen as a base whose positive ion had about the 
same speed as the ion of anthranilic acid.* 
Conductivity of Cinchonin Hydrochloride. 
25° C. 0 = 16 m = 76-4 
0°C. 0 = 16 ^ = 39-9 
The temperature coefficient was taken as being approximately *5, and /n v for 
anthranilic hydrochloride at zero calculated from the formula — 
^o = /%{l-(25 x-0 5/r) } 
.*. at v= 16 /x 0 = 102-6 (1 — *625) 
= 38-62. 
Conductivity of Anthranilic Hydrochloride at Zero. 
0. 
MHC1. 
Mu. 
M. ( , 
X . 
h 
K' 
16 
247 
38-6 
93-5 
•2634 
169-8 
20 
249 
39-0 
98-3 
•2824 
180-0 
We see that the depression of the freezing-point gives values for the 
hydrolysis constant which differ very widely from the conductivity values, 
* Bredig, loc. cit., p. 231. 
