172 



Gooch and Norton — Iodometric 



volume of the liquid, as indicated upon the scale, had dimin- 

 ished to 25 cm3 , when the distillation was interrupted. The appa- 

 ratus was manipulated as before to prevent access of air, and 

 the iodine evolved in the second treatment determined. A 

 third period of distillation served to show the iodine liberated 

 during the concentration of the liquid from 25 cm3 to 10'" '. 





HC1 



Sp.gr. 112 



taken. 





Mo0 3 



Mo0 8 



corresponding to iodine found. 





Klin 

 retort. 



taken as 

 ammonium 

 molybclate. 



1 st stage 

 40c.u3 t0 



32 C,M ; . 

 Green color. 



2d stage 

 32 cm8 to 



3d stage 

 25 cm8 to 



10 cm.", 





cm 3 



grm. 



grm. 



grm. 



grm. 



grm. 



(1) 



40 



0-5 



02455 



0-2399 



0-0076 



0-0004 



(2) 



40 



0-5 



0-2455 



0-2402 



0-0053 



0-0013 



(3) 



40 



0-5 



0-2455 



0-2414 



0-0040 



0-0004 



(4) 



40 



0-75 



0-2455 



0-2404 



0-0061 



0-0004 



(5) 



40 



0-75 



0-2455 



0-2431 



0-0037 



0-0004 



(6) 



40 



1- 



0-2455 



! 0-2404 



0-0085 



0-0019 



(7) 



40 



2- 



0-2455 



I 













M0O3 



1 



Mo0 3 





M0O3 







corresponding 





correspond- 





! corresponding 







to iodine found 





ing to iodine 





to iodine 







during period 



Error. 



found in con- 



Error. 



found in con- 



Error. 





of Friedheim 





centrating 





centrating 







and Euler. 





from 40 cm3 





from 40 cra3 to 







(1st stage.) 





to 25 em3 . 





]Qcm3 







grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



(1) 



0-2399 ,0-0056 — 



0-2475 



0-0020 + 



0-2479 



0-0024 + 



(2) 



0-2402 0-0053— 



0-2455 



o-oooo 



0-2468 



0-0013 + 



(3) 



02414 0-0041 — 



0-2454 



.o-oooi- 



0-2458 



0-0003 + 



(4) 



0-2404 0-0051 — 



0-2465 



0-0010 + 



0-2469 



0-0014 + 



(5) 



0-2431 0-0024 — 



0-2468 



0-0013 + 



0-2472 



0-0017 + 



(6) 



0-2404 



0-0051- 



0-2489 



0-0034 + 



0-2508 



0-0053 + 



(V) 













j 0-2495 

 ' "j 0-2529* 



0-0040 + 













0-0074 + 



* On repeating distillation with a fresh charge of acid. 



During the first period of distillation the liquid assumed the 

 clear green color, which changed but slightly until the begin- 

 ning of the third period, when the tint verged upon olive, and 



