62 



Dr. H. J. S. Sand on the Concentration 



1 — n c being found by equation (12). These values are 



intermediate between those in the other two columns and 



given merely for comparison with the experimental numbers. 



At the end of the table I have also given the concentration 



of the solution of pure copper sulphate examined, and the 

 rr 



value of ;£- derived for it from equation (8), n a having been 



taken as 0*63 *. 



Table I. 



Mv 

 No. 



Schrader's 



No. 



My solutions. 



Schrader's 



solutions. 



aing. 



B in g. 



Cone, of 

 Cu in 



Cone, of 

 H o S0 4 in 



Cone, of 

 Cu iri 



Cone, of 

 H 2 S0 4 in 







mg.-equiv. 



mg.-eqiuv. 



mg.-equiv. 



nig-equiv. 











cc. 



cc. 



cc. 



cc. 



01743 



0-00828 



A. 



4 



0-1634 



00881 



01670 



00926 



B. 



5 



0-2407 



01327 



2490 



0-1375 



02057 



0-00988 



C. 



2 



0-06618 



00275 



0-06618 



00275 



00903 



0-00360 



D. 



10 



0-1483 



01804 



0-1483 



0-1804 



0-2501 



0-00860 



E. 





02096 













Table I. (cord.) 



My 

 No. 



k in 

 (ohmXcm.)-l. 



a in 



cm 2 



i 2 t max. (in 



milamp., sec, 



cm.) 



i 2 t min. (in 



milamp., sec, 



cm.) 



%H ace. to 16 



(in milamp., 



sec, cm.) 



ohmXmg.-equiv. 



A. 



0027 



15x10-3 



1609 



836 



1246 



B. 



362x10690x10-8. 



15x10-3 



3330 



1773 



27-6 



C. 



79-5x10690x10-8. 



17+10-3 



265 



141-0 



192-3 



D. 



391x10690x10-8. 



15x10-3 



1064 



691-5 



925 



E. 





K 



10-9x1-195 ( 



nilamp., sec, c 



m.). 



Note.— The value of k for solution A has not heen given by Schrader. The 

 number 0'027 is an approximate value, calculated from Kohlrauseh's tables. 



* According to Kohlrausch's tables, its value at the concentration 



0-2 m g-' e( l ulv - i s 0-643, and at the concentration 0-02 it is 062. 

 cm. d 



