268 Prof. Graham on the Diffusion of Liquids, 



(3.) Another pair of salts were simultaneously diffused, but 

 with an accidental difference of 0°*4 of temperature. 



Table IX.— Diffusion of Bicarbonate of Potash, KO, CO 2 

 + HO,C0 2 ,at64°*l,and Bichromate of Potash, KO,2Cr0 3 , 

 at 64°*5. 



Parts of anhydrous salt to 100 

 water. 



Density of 

 solution at 60°. 



At 64°-l i 



md 64°-5. 











Experiments. 



Mean. 



Bicarbonate of potash. 









2 



1-0129 



574 

 577 









5-91 



5-81 



4 



1-0252 



10-75 

 11-16 









1113 



11-01 



Bichromate of potash. 









2 



10139 



5-64 

 5-73 









5-59 



5-65 



4 



10273 



11-55 

 11-54 









11-39 



11-49 



Here again the two salts approach closely in diffusion, and 

 also correspond well with the two preceding series. 



Mean Diffusion at 64.°*1 and 64°*5. 





2. 



4. 





5-81 

 5-65 



1101 

 11-49 



Bichromate of potash 





It is singular to find that salts differing so much in consti- 

 tution and atomic weight as the chromate and bichromate of 

 potash, may be confounded in diffusibility. The diffusion 

 products of these two salts are, for the 2 per cent, solutions, 

 5*77 and 565 grs., and for the 4 per cent, solution, 11*19 and 

 11*49 grs. The bicarbonate of potash also exhibits a consi- 

 derable analogy to the carbonate, but resembles still more 

 closely the acetate. It is thus obvious that equality, or simi- 

 larity, of diffusion is not confined to the isomorphous groups 

 of salts. 



(4.) The nitrates of potash and ammonia have already ap- 

 peared to be equidiffusive at two different temperatures. 

 They were diffused again in the same proportions as the last 

 salts, at a temperature varying from 63° to 67°'5. 



