48 



WORK OF C. M. STINE. 



Table 35 Continued. 



Hydrates. 



m 



M 



Sp. gr. cor. 



Mr. 



H c 



0.4 Feds.... 

 0.4 A1C1,. . . 

 0.8 Fed, . . . . 

 0.8 A1C1,.. .. 

 1.2 FeCl... 

 1.2 AlCU . . . 

 1.6 Fed,... . 

 1.6 Aids.... 

 2.0 Fed 3 ... 

 2.0A1CU.... 

 2.4 Fed 3 .... 

 2.4 Aids.... 

 2.7234 Feds. 

 2.7234 Aids. 



4.31 

 5.08 

 3.57 

 4.44 

 2.67 

 3.74 

 2.37 

 3.43 

 2.03 

 3.02 

 1.86 

 2.83 

 1.86 

 2.53 



0.S 

 2.1 

 3.5 

 4.8 

 6.3 

 7.8 

 9.2 



-o 

 v 

 c 



IS 



E 

 o 

 U 



It is to be noted that the conductivity measurements which are given in table 

 35 are the merest approximations to measurements of dissociation. The conduc- 

 tivity measurements are made at zero, whereas some of these mixtures freeze very 

 considerably below 0C. There is 

 marked hydrolysis in some cases, as 

 already mentioned, leading to a pre- 40 



cipitation of the iron. There is con- 

 siderable difference between the viscos- 

 ity of the single solutions and of the 

 mixtures where the normalities are the 

 same. The assumption that these salts 



dissociate at once, in the most con- 



+++ 

 centrated solutions, into M, CI, CI, CI, 



is certainly not correct. Finally, the 

 values of /i> are obtained by calcula- 

 tion, and may differ considerably from 

 the true values because of the factors 

 just mentioned. 



The values of M and of M e are 

 plotted as curves in fig. 16. The gen- 

 eral relation shown by these curves are 

 the same as have previously been 

 pointed out. The fact that the hy- 

 drating power of both the aluminium 

 chloride and the ferric chloride is appar- 

 ently greater in the mixture than in the 

 separate solutions, in the most dilute 

 solutions employed, is probably due to the effect of hydrolysis in increasing the value of 

 L, and consequently diminishing M, though it may possibly be due, in part, to change 

 in dissociation and difference in the hydrating power of the ions and molecules. It 



-I 20 



S 

 s 







2 



B 



2 



10 



.5 1. 1.5 



Gram Molecules of Salt per Liter of Solution 

 Fig. 16. 



I. 



Aluminium Chloride Alone. 



Aluminium Chloride Mixed with Ferric Chloride. 



III. Ferric Chloride Alone. 



IV. Ferric Chloride Mixed with Aluminium Chloride. 



II. 



