1530 
3. Electrical Conductivity. 
The specific conductivity of a glutaconic acid solution of arbitrary 
concentration (determined directly after dissolving the acid) was, 
after remaining for three hours at 25°, still quite unchanged, even 
if to the solution had been added a small quantity of hydrochloric 
acid or aqueous sodium hydroxide. Hence, there was no question 
of isomerisation in these circumstances. 
The dissociation constant of the acid was determined by the 
method described elsewhere *). Subjoined are given the results obtained 
with acids of different origin. 
AA LOS 
Ds RL 
v | a | Ko 
24.804 | 15.04 0.0630  —-1.70>< 10-4 
26.359 20.46 856 | 1.13 
49.788 21.10 882 | iz 
92.718 28.52 Oren al et 
99.516 | 29.09 | 122. i-70 
199.15 \__ 40.18 | 168 | 1.70 
TO | u5se22 || 293. |. 1.73 
308.30 54.61 | 229 1.71 
741.74 70.46 | 295 1.72 
1483.5 93.31 | 301 1.70 
1593.2 | 96.14 402 1.70 
Mean 
Ke A LOSS: 
B. At 25° (see table p. 1531). 
The mean from this and two other series is: 
ET IDO 
WALDEN *) found for an acid of Conrad m.p. 132°: K**—1.83 10 
(u,, = 379.5); his constants inerease somewhat on dilution. 
The dissociation constant of glutaric acid is 4.72 10; by 
1) Rec. 35. 79 (1915). 
2) Ph. Ch. 8. 501 (1891), 
