Proof of Arrhenius' s Generalization, 



133 



the law more accurately. From the intimate connexion which 

 exists between Van't Hoff's laws and the dissociation theory, 

 it follows also that the generalization of Arrhenius may find 

 a more exact experimental confirmation in dilute solutions. 

 Therefore a more exact confirmation of the generalization of 

 Arrhenius in very dilute solutions is not only important on 

 account of the great light which the theory of dissociation 

 has thrown upon the two provinces of chemistry and physics, 

 but it is also important inasmuch as thereby the laws of 

 Van't HofT will find in every point their more exact con- 

 firmation. 



We found above the normal value of the molecular lowering 

 of the freezing-point in the cases of cane-sugar, urea, and- 

 alcohol — substances belonging to the class of bad conductors 

 of electricity. In the following Tables are given the results 

 obtained with sulphuric acid, potassium chloride, dichloracetic 

 acid, trichloracetic acid, and orthonitrobenzoic acid. First 

 come the experimental data. (The meanings of a, 7, 8, e, <f>, 

 b, c, </, k, have already been given with Table I.) 



Table V. 



Trichloracetic Acid. 



0* 

 Ot 



0-005132 1 

 0-010182 + 

 0017636 1 

 0-029761 $ 

 00414 \ 

 0* 

 Ot 

 0-04443 J 



•4842 



•4858(9) 



•4666(7) 



•4487 



•4232(1) 



•3798(9) 



•3397(8) 



•4841 



•4857 



•3304 



o o 



•4842 



•485S--4859 



•4666--4G67 



•4487 



•4232--4233 



•3797--3799 



•3S97--3399 



•4840--4841 



•3304 



8 



b. 



0-950 



10 



0-768 



10 



070 



10 



0-978 



10 



0-852 



12 



0-987 



10 



0-827 



10 



0-748 



i'o 



0-67 



•1-8 

 -1-7 

 •2 

 ■1-9 

 ■2 

 2 

 ■1-8 



-1- 



20-3 



20-6 



20 



19-5 



19 



18 



18 



17-5 



i7 ; 8 



fa 



millim. 



758 



758 



758 



757-9 



758 



758 



758 



757 



757 



757 



Dichloracetic Acid. 



0* 



•4852 





+ 



•4867 





0002573 * 



•4758 





0-005125 * 



•4669(70) 





0010230 \ 



•4515 



• • • 



0-015294 % 



•4366(5) 





0-02032 X 



•4220(1) 





0* 



•4834(5) 





0-027551 X 



•3933 







0-82 



t • • 



0-80 





0-795 





0-785 





0-766 



« • • 



0-730 





0-615 





0-685 



... 



0-680 



* Ice-cap round the bulb of thermometer. 



t The ice-cap is avoided in a manner described in Zeitschr. phys. Chemtc x\. 



X No ice-cap on the Hg bulb of the thermometer. 



