D. A. Kr eider — Iodine Titration Voltameter. 5 



in these cases were not as accurately made, nor the solutions 

 standardized with the same care that characterized the later 

 determinations, as will be seen from the sequel. 



Table I. 



f Diani. of cell = 2 cm . 

 , . „ ,, ,, J Length of cell = 12 CDn . 

 (a) Small cell <j E lecWes l-6x2-?™. 



[_ Dist. between nearest edges of electrodes, 5 cm . 



KI 



grms. in cc. of 

 solution 



HC1 



(1:4) 



Current 



(approx.) 



amp. 



Current 

 density 

 (approx.) 



am P-/l^ 



P. D. 

 Volts. 



Time 

 ot 



run, 

 mins. 



not 



measured 



0-13 

 0-13 



7-5 



20 

 5 



20 

 20 



0-25 

 0-40 

 0-5 



0-5 

 0-5 



0-5 



Od 



0-5 



0-015 



0-015 



0-029 

 0-046 

 0-058 



0-058 

 0-058 



2-25 

 2-00 



22* 

 35* 



15 



1 9 



more 

 4| more* 



lto 



0-058 5- 



0-058 

 0-058 



12-4 



7-815* 

 47jl3* 



12-547* 



4-885* 

 5-8 54* 



Solid iodine at anode 

 Solid iodine at anode 

 Solution alkaline 

 Solid iodine in large 

 quantity at anode 



(b) Large ceil •{ 



f Diam. of cell = 3 cra . 

 Length of cell = 15 CIU . 

 . Electrode (anode) 2*5 x 6 cn 

 [ Distance nearest edges, 5 C 



9 5 • 



20 



40 



0-5 



0-017 



2- ' 



3*5 41* Solid iodine at anode 









( 0-5 



0-017 



1-5 < 



2-5 91 



10 10 ■ 



20 



40 



] 1-0 



0-033 



4-1 ' 



4-7 2 more 









1-5 



0-050 



5-7 



| 1 more* Solid iodine at anode 



Gas evolved at anode. 

 Table II. 







. Iodine voltameter. 







Cu- voltameter. 





Distance 

 between 



elec- 

 trodes, 

 cm. 



! 1 - 



K1 Cur- 3 

 °"rms. \ 



° . * rent > _• 

 m °^ 



cc. : am P- | 



! : 



x 0= i Copper 

 -.3 ^ • eqniv- 

 55 »8 alent. 



1 ; 1 ; grm S : 



j 



Copper 

 grms. 





1 



2 



3 



i («) « 



\(b) 



5 



* ™ T? ' 0-5 0058 

 4 " 7*5 ) 



* ( I , [ 0-5 0-058 



4 " 7 - o \ 



5 " 7*5 0-5 0-058 



H 



45 -j 

 45 



73-90 

 73-72 



132-87 

 132-71 



134-21 



0-2391 1 

 0-2385 



0-4202 

 0-4198 



0-4244 



0-2379 



0-4199 

 0-4203 



0-4234 



0-4240 



1 



0-013 

 0-013 

 0-013 



