[ 34-1 ] 



XLIII. On the Diffusion of Liquids. 

 By Thomas Graham, F.R.S., F.C<S. 



[Concluded from p. 281.] 



III. Diffusion of Salts of Soda. 



(1.) HPHE only salts of soda which I have yet had an oppor- 

 J- tunity of diffusing in a sufficient variety of circum- 

 stances are the carbonate and sulphate. These salts appear 

 to be equidiffusive, but to diverge notwithstanding more widely 

 in the solutions of the higher proportions of salt than the cor- 

 responding potash salts. It is a question whether this in- 

 creased divergence is not due to the less solubility of the soda 

 salts, and the nearer approach consequently to their points of 

 saturation in the stronger solutions. 



Table XIII. — Diffusion of Carbonate and Sulphate of Soda. 



Parts of anhydrous salt to 



Density of 

 solution at 



At 64°. 



At 37°7 











100 water. 



60°. 



Experi- 

 ments. 



Mean. 



Experi- 

 ments. 



Mean. 



Carbonate of soda 













2 



10202 



415 



4-08 





2-78 

 262 









4-21 



414 



273 



2-71 



4 



10405 



7-96 

 770 





531 

 4-94 









768 



7-78 



5 35 



5-20 



6| 



10653 



1216 

 12-06 





8-50 

 8-45 









12-45 



12-22 



805 



8-33 



10 



1-0957 



17-13 

 16-53 

 17-00 



16-88 







Sulphate of Soda 













2 



1-0179 



4-35 

 4-32 





2-96 

 3-03 









425 



4-31 



3-09 



303 



4 



10352 



814 



8-10 





5-63 

 5-64 









8-28 



8-17 



5-42 



5-56 



n 



1-0578 



13-26 





8-77 









13-63 





8-84 



8-80 







13-61 



13-50 







10 



10847 



18-71 

 19-73 

 18-91 



19-14 







The range of the thermometer during the continuance of 

 the experiments at the higher temperature was from 64?°' 5 up 

 to 65° and falling again to 63°; the mean of all the days being 

 64°. The temperature of the other series, or of the ice-box, 



