52 



Journal of the Asiatic Society of Bengal. [February, 1910. 



Table IV. 



Effect of Nickel Carbonate suspended in the Solution. 



Second. 



840" 



840" 

 840" 



Ampere. 



Ca. gain. 



An. loss. 



9204 



8874 



840" 



^40" 



8803 



8794 



8874 



2147 



E.C.E. (Ca.). 



E.C.E. (An.) 



2137 



2062 



0106 



0002776 



0002867 



1341 



•0095 



0111 



0002788 



0000143 

 0000128 



0001814 



2090 



0002803 



0000150 



The character of the deposit obtained in this group of 

 experiments was markedly different from that obtained in pre- 

 vious experiments from clear filtered solutions, being more or 

 less of a spongy, brittle and loose character. The colour was 

 of a dark shade, quite unlike the white deposits obtained 

 before. 



The values of the e.c.e. though irregular, yet kept within 



of the theoretical value (-0003043), 

 except in experiment 4 where it fell too low owing to loss at 

 the time of washing. As the deposits were invariably loose 

 and apt to fall away at washings, it was very difficult to tell 

 whether the defect in value was due to only partial neutraliza- 

 tion of acid or to a non-adherent deposit or to both causes. 



a much smaller range 



The Cathode in a Porous Enclosure. 



most 



nate 



nickel 



deposit was 

 from contact with 



oming, as they did, into contact with the 

 made the deposits non-adherent. An adhe- 



be kept 

 The following ex- 



periments were performed with the cathode plate wrapped up 



in 



mixed with ni 



nickel 



flowing through the 



voltameter as described before. This 

 arrangement combined the twofold advantage of large dilution 

 and prompt neutralization of acid at the anode. The filter 

 paper protected the cathode surface from contact with the car- 

 bonate particles. The results are given in Table V. 



