Gooch and Beyer — Use of the Filtering Crucible. 25-5 



Table III. 

 Third Process : Electrolysis and continuous nitration. 

 Vol. Theory 



CuS0 4 .5H 2 

 taken 

 grrn. 



(1) 0-5013 



(2) 0-5003 



(3) 0-5015 



(4) 0-5001 



50 

 50 

 50 

 50 



(5) 0-5041 50 5 



of H 2 S0 4 for 



liquid (1:1) Current Time copper 



cm 3 , cm 3 , amp. volt. min. grm. 



2(5(5 



7 1 20 



5 



20 



\ 5 



u 



5 



7 



in 



o 



20 

 5 



20 

 5 



20 



0-1277 

 0-1274 

 0-1277 

 0-1274 



Copper 



found Error 



grm. grm. 



0-1280f +0-0003 



0-1276J +0-0002 



0-1279* +0-0002 



0-1274* 0-0000 



0-1284 0-1285| +0-0001 



No copper in filtrate or washings. 



f Trace of copper in filtrate. 



% Trace of copper in washings. 



Table IV. 

 Fourth Process : Electrolysis and continuous filtration, with the use of the 



CnS0 4 .5H 2 

 taken 

 grm. 



(1) 0-5025 



(2) 0-5009 



(3) 0-5025 



(4) 0-5011 



porcelain crucible. 

 Vol. Theory 



of H 2 S0 4 for 



liquid (1:1) Current Time copper 

 cm 3 . cm 3 , amp. volt. min. grm. 



Copper 

 found 



Error 

 grm. 



50 



50 



50 

 50 



5 



(5) 0-5013 50 5 



2 

 3 

 4 

 2 

 3 

 4 



\ 2 

 } 4 



1 2 



2 

 4 



6 



15 0-1280 

 10 



10 



6 ( 5 



8-j 15 0-1276 



10 ( 15 



6 j 5 

 10 ) 25 



grm. 

 0-1277f —0-0003 



0*1279* +0.0003 



6 j 



10 



j 6j 5 

 ( 10 I 25 



0-1280 0-1278* —0-0002 

 0-1276 0-1273f —0.0003 

 0-1277 0-1276f —0-0001- 



* No copper in filtrate or in washings. \ Trace of copper in filtrate. 



X Trace of copper in washings. 



large and expensive apparatus of platinum. The use of the 

 filtering crucible as a part of the electrolytic cell makes possible 

 the utilization of operations and conditions in which the deposit 

 may lack the degree of adhesiveness necessary in ordinary 

 electrolytic processes ; and it is hoped, therefore, that the 

 device may extend the range of electrolytic analysis. 



It is obvious, of course, that in the First Process and in the 

 Second Process a single suction apparatus may serve to make 

 nitrations for many cells, so that several electrolytic operations, 

 started successively, may be carried on simultaneously without 

 loss of time to the analyst. 



