G. Edgar — Iodometric Estimation of Yanadic Acid. 177 



" bumping." The flask is similar in design to that used by 

 Professor Gooch for the determination of boric acid and has 

 been convenient and serviceable not only for this but for 

 other processes involving distillation ; it being very simple 

 and doing away with the necessity of ground glass connections. 



Summary. 



It has been shown that vanadic acid, chromic acid and iron 

 may be accurately estimated in the presence of one another by 

 an iodometric process based upon the differential reducing 

 action of hydrobromic and hydriodic acids, upon the substances 

 in question ; one constituent, the chromium, being estimated 

 in a separate portion by reduction with arsenious acid. 



Table (I). 















(I) 



(II) 















N/lOx 



N/lOx 



Taken 



Found 



Error 



Taken 



Found 



Error 



•9968 



•9968 



v 2 o 5 



V 2 5 



v 2 o 5 



Fe 2 3 



Fe 2 3 



Fe 2 3 



Na 2 S 2 3 



Na 2 S 2 3 



grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



cm 3 . 



cm 3 . 



0-1532 



0-1532 



±0-0000 



0-1515 



0-1515 



±0-0000 



16*85 



35-88 



0*1532 



0-1532 



±0-0000 



0-1515 



0-1518 



+ 0-0003 



16-85 



35-91 



0-1532 



0-1531 



—o-oooi 



0-1515 



0-1518 



+ 0-0003 



16-84 



35-90 



0-1532 



0-1531 



— 0-0001 



01515 



0-1516 



+ o-oooi 



16*84 



35*88 



0-1532 



0-1535 



+ 0*0004 



o-ioio 



o-iooi 



— 0-0009 



16-89 



29*46 



0-1532 



0-1533 



+ 0-0001 



0-1010 



0-1007 



— 0-0003 



16-86 



29-50 



0-0511 



0-0509 



— 0-0002 



0-1515 



0-1516 



+ 0-0001 



5-60 



24-64 



00511 



0-0511 



±0-0000 



0-1515 



0-1515 



±0-0000 



5-62 



24-65 



0-2042 



0-2045 



+ 0-0003 



0-0505 



00502 



— 0-0003 



22-50 



28-80 



0-2042 



0-2042 



±0-0000 



0-0505 



0-05,05 



+ 0-0000 



22-47 



28-82 



