112 Prof. W. Ostwald's Electrochemical Researches. 

 Formic Acid. 



p- 



mol. c. 



log tan mol. c. 



Difference. 



1 



2 

 3 

 4 

 5 

 6 

 7 



1 8 



9 



10 



1-758 



2-465 



3-431 



4-796 



6-634 



9-180 

 12-59 

 16-98 



22-43 | 

 2902 



8-4870 

 8-6340 

 8-7778 

 8-9240 

 90656 

 9-2085 

 9-3490 

 9-4848 

 9-6157 

 9-7441 



0-1470 

 0-1438 

 0-1462 

 01416 

 0-1429 

 0-1405 

 0-1358 

 0-1309 

 0-1284 



Hypophosphorous Acid, 



p. 



mol. c. 



log tan mol. c. 



Difference. 



1 



2 

 3 

 4 

 5 

 6 

 7 

 8 



30-89 

 37-91 

 45-81 

 54-13 

 62-10 

 69-06 

 74-05 

 77-84 



9-7767 



9-8914 



0-0123 



0-1408 



0-2762 . 



0-4172 



0-5439 



0-6666 



01147 

 0-1209 

 0-1285 

 0-1354 

 0-1410 

 0-1267 

 0-1227 



The differences do not exhibit a constant value ; they are 

 somewhat greater for the strong than for the weaker acids. 

 The details are not given for the other acids, but only the 

 mean values of the differences ; these mean values are as 

 follows : — 



Butyric... 0-155 Formic 0-140 Dichloracetic 0133 Iodic... 0*126 



Acetic ... 0-145 Ohloracetic. 0-136 Hypophosphorous 0-127 Chloric ! 140 



The mean of these is 0*136; but the individual means 

 deviate from this much more than can be accounted for by 

 experimental errors. These deviations may be considered as 

 follows : — If p represent the dilution-exponent at which the 

 conductivity is equal to half the maximum, 45 in the present 

 units, then tan 45° = unity, and log tan 45° = 0. Then for every 

 other dilution-exponent p, 



logtanm = *136 (p—po) ', 

 where m is the molecular conductivity, referred to 90 as the 

 maximum. Putting the quantity of water, v, in place of the di- 

 lution- exponent,^, we have v = 2 p , and logv=plog2 = , 30103p, 

 or p = 3*032 log v, and the equation given above becomes 



log tan w = *136 x 3*032 (log v - log v ) = '4124 log -, 



