﻿48 



INDIANA UNIVERSITY 



capillary delivery tube with stop cock (c). At the end of the large 

 bore tube, another capillary tube was sealed. Marks (b and f ) were 

 made upon these capillary tubes with hydrofluoric acid. The pur- 

 pose of the large boxe tube was . to serve as a convenient reservoir 

 for the constant excess of mercurj^ which was required for cathode 

 material. Connection was made with the cathode by means of a 

 platinum wire which was sealed into the tube at (g). The anode 

 cell used in these experiments was a Gooch crucible, containing a 

 layer of glass wool, upon which rested 20 to 30 grams of mercury. 

 This crucible was placed in the thistle tube (Figure II) so that it 

 was partially immersed in the electrolyte. This arrangement of the 

 electrodes provided for a very efficient and convenient stirring of 

 the electrolyte. The heavy liquid falling from the anode mixed 

 with the light liquid rising from the cathode, and thus the electro- 

 lyte was thoroughly stirred. At no time was any mechanical stirring 

 or mixing required. 



At the beginning of an experiment, the cell was filled with mer- 

 cury between the marks (b and f). The mercury was then forced 

 into the thistle tube by blowing, or by the use of a rubber bulb 

 (attached at h), enough being left in the reservoir tube to make 

 good contact with the negative terminal wire. At the termination 

 of an experiment, the mercury was allowed to flow back to the 

 mark (f), and the excess above the graduation (b) was run into a 

 beaker to be weighed, or into small specially prepared graduated 

 flasks for measurement. The data from a number of experiments 

 are given in the following table : 



Hg AND Cii Voltameters in Series. 



Exp. 

 No. 



Cur- 

 rent. 



Nr.D.,00 



Anode. 



N.D.,00 

 Cathodo. 



Wt. Cu 



Deposited. 



Wt 11 g 

 Deposited. 



Hg Calculat- 

 ed from Cu. 



% 

 Error. 



Remarks. 



















N(,s.:^-ti,the 



3 



0.135 



4.18 



1.89 



0.3068 



1.9386 



1.9302 



4 0.43 



^ depop. Hr 



4 



0.135 



4.18 



1 89 



0.2207 



- 1.3813 



1.3880 



-0.48 



1 was meas- 



5 



0.410 



12.71 



5.74 



0.3221 



2.0180 



2.0258 



-0.38 



} ured in a 



6 



0.550 



17.05 



7.70 



0.4985 



3.1000 



3.1037 



-0.12 



j graduated 

 capillary 



7 



0.850 



26.35 



11.90 



1.0457 



6.5578 



6.5767 



-0.28 



tube. 



8 



1.60 



49.60 



22.40 



1.7712 



11.0816 



11.1396 



-0.52 





9 



2.30 



71.30 



32.20 



1.4427 



9.1225 



9.0736 



+ 0.53 



Electrolyte 



















warm. 



10 



3.10 



96.10 



43.40 



1.6545 



10.4013 



10.4056 



.-0.04 



Electrolyte 



















very warm. 



11 



0.20 



6.20 



2.80 



0.4936 



3.1075 



3.1044 



+ 0 10 





12A 



0.50 



15.50 



7.00 



1.4220 



8.9808 



8.9421 



+0 40 





12B 



0.50 



15.50 



7.00 



1.4220 



8.9700 



8.94-4 



+ 0.30 





13B 



0.85 



26.35 



11.90 



1.49r6 



9.4^48 



9. £437 



+ 0 43 





14A 



0.50 



15.50 



7.00 



1.2227 



7.6707 



7.6899 



-0.25 





14B 



0.50 



15.50 



7.00 



1.2237 



7.6908 



7.6899 



+ 0.01 





