164 



Prof. J. Walker. 



[Feb. o, 



must be somewhat too high, and in consequence the speed of the kation 

 is estimated at too high a figure. In order to proceed in a systematic- 

 way, I have added 6 in each case to the anion values found by 

 Winkelblech for the amino-benzoic acids, and adopted the figures so 

 obtained as the kation velocities in the succeeding calculations. The 

 value of fi* thus estimated is about 7 per cent, below that obtained 

 by adopting Winkelblech's velocity for the kation. For the ortho-acid 

 we have fi* = 32 + 38 = 70. 



Calculating with these constants, we arrive at the values given in 

 the following table : — 



^-Amino-benzoic Acid, 1 : 2-NH 2 .C G H 4 .COOH. 

 hlK= 112, K = 1-02 x 10-s, /XooH+XOH" - 357, ^HX+XOH- = 70. 



V. 



a. 



d. 



fi calc. 



fi expt. 



Jc calc. 



Mo.)- 





64 



23 '9 x 10-* 



40 -1 x 10~ 5 



7-26 



7 -21 



6-6 



6-6 



6 5 



128 



20 -3 



17 -0 



10-8 



10 -8 



7 -4 



7-4 



7-4 



256 



16 -3 



6 7 



16-1 



16 2 



8 3 



8 -4 



8-4 



512 



12 -3 



2 5 



23 -3 



23-6 



8-9 



9 -1 



9-2 



1024 



9-0 



0-88 



33 5 



33 7 



9 5 



9 7 



9-6 



The experimental values of the molecular conductivity //. are the 

 means of the concordant series of Ostwald and Winkelblech. It will 

 be seen that the agreement between these and the calculated values is 

 very close. For comparison the "constants" /j o x10 6 derived from 

 the calculated and the experimental values of p have been added. 



The conductivities of solutions of para-amino-benzoic acid have been 

 measured by the same observers, and Winkelblech determined the 

 ratio k h jK, which he found by the catalytic method to be 210. With 

 this constant the value of Jc a appears to be nearly 10 per cent, above the 

 value of k Q at v = 1000. Adopting for the latter the mean of the 

 numbers found by Ostwald and Winkelblech, viz. I'll x 10~ 5 , we 

 obtain k a = l'2l x 10~ 5 . 



^-Amino-benzoic Acid, 1 : 4-NH 2 .C 6 H 4 .COOH. 

 k b /K= 210, fc a =l-21 x lO- 5 , /^H+XOH- = 356, ^HX+XOH" = 68. 



V. 



a 



d. 



(calc.) 



(O.) 



(W.) 



i 



(calc.); (0.) 



(W.) 



32 



22 3 x 10~ 6 



138 -7 x 10~ 6 



5-55 





5 43 



7-7 — 



7-4 



64 



20 9 



64 4 



7-55 



7 53 



7-49 



7 2 j 7-2 



7 1 



128 



18 7 



28-7 



11 -oo 



10 -86 



11 12 



7-7 7-5 



7 9 



256 



15 8 



12 



16 -47 



16 34 



16-84 



8-8 ! 8-7 



9-1 



512 



12 5 



4-64 



24 37 



24 -24 



26 29 



9-8 | 9-8 



10 -6 



1024 



9 4 



1 -70 



35 40 



35 01 



36 -86 



10'7 j 10 5 



11-7 



