388 



Dr. R. A. Lelifeldt on Electromoti 



ce 



Zixc Sulphate, 



Concentration-cells with migration. 

 Moser's observations. 



Mass of 

 ZnS0 4 -7H 2 

 to 100 g. soln. 



1 

 15 

 30 

 45 

 60 



E.M.F. 

 in 



Daniells. 



gin. -equiv. /litre. 

 1000 c. 



logC 



E.M.F. from 

 normal soln. 

 Volts X 10 -4. 



! 



0-018 

 0-0225 



0-02D5 

 0-0382 



0-0731 



1-155 



2496 



4-099 



6-44 



5-8639 

 30626 

 3-3972 

 3-6127 



3-8089 



-185 



4- 10 



59 



134 



228 



By interpolation 

 normal solution 

 lies 0-0010 volt 

 below 15% solu- 

 tion. 



Wright and Thomson's observations. 



«ZnSO t 4- 

 100H 2 O. 



E.M.F. 



in 



B. A. volts. 



gm.-rquiv. /litre. 

 1000C. 



logC 



E.M.F. from 

 normal soln. 

 Volts X 10-4. 





»=O100 



00395 



0-116 



4-0645 



-153 





0-1 G7 



372 



0192 



4-2838 



130 





0237 



348 



0-271 



4-4326 



106 



By interpolation 



0-5 



284 



0-548 



4-7388 



43 



normal solution 



10 



232 



1-115 



3-0472 



+ 8 



lies 0-0008 volt 



2 



169 



2-359 



3-3727 



70 



below ZnS0 4 4- 



3 



118 



3272 



5-5148 



120 



100H 2 O ? 



4 



056 



4341 



3 6376 



182 





5 



... 



5-321 



3-7260 



237 





Lussana , s observations. 



Mols. ZnS0 4 



in 100,000 g. 



water. 



120 



18-8 



72-7 

 195-8 

 556-3 



E.M.F. 





volts 



(differences) 



> 



0-0052 



> 



83 



> 



80 



> 



114 



gin. -equiv./ litre. 

 1000 0. 



0-110 

 0-149 

 0-724 

 1-791 

 4150 



logC 

 = -*■ 



40414 

 4-1732 

 4-8597 

 3-2531 

 3-6180 



E.M.F. from 

 normal soln. 

 Volts X 10-4. 



-166 



114 



31 



4- 49 

 163 



By interpolation 

 normalsolution lies 

 0-0031 volt below 

 72-7 ZnS0 4 solu- 

 tion. Temperature 

 about 23°. 



