458 



Walker and Gillespie — Application of 



emulsion. Blank analyses were made to insure against mechan- 

 ical loss of iodine during boiling and to prevent any error on 

 account of the presence of carbonate or other impurity in the 

 solutions employed. 



Some of the results obtained with barium hydroxide are 

 given in Table I. The variation in different analyses of the 

 same series is not large, and the results are independent of the 

 amount taken for analysis and of the excess of iodine em- 

 ployed. 



Table I. 

 N 

 Analyses of — Barium Hydroxide Solution. 



(By boiling in a trapped flask with an excess of iodine.) 

 Iodine 





Ba(0H) 2 



Iodine 



absoibed 



Ba(OH) a 









taken. 



taken. 



by Ba(OH) 2 . 



found. 



Mean. 



Variation. 





cm 3 . 



grm. 



grm. 



grm. 



grm. 



grm. 



(1) 



10 



0-13 



0-1054 



0-0712 



0-0699 



0-00 13 + 



(2) 



10 



0'14 



0-1028 



0-0692 



00H99 



0-00O7 — 



(3) 



20 



0-23 



0*2072 



0*1399 



01398 



o-oooi + 



(4) 



20 



025 



0-2074 



0-1401 



0-1398 



0-0003 + 



(5) 



40 



0-44 



0-4143 



0-2798 



0-2796 



0'0OO2 + 



(6) 



40 



0*44 



0-4148 



0-2802 



0-2796 



0-O006 4- 



(?) 



40 



0-48 



0-4160 



0-2809 



0-2796 



0*00 13 + 



(8) 



40 



0*48 



0-4126 



0-2786 



0-2796 



O-OOlo — 



(9) 



40 



0-51 



0-4115 



0-2779 



02796 



0-00 17 — 



(10) 



40 



0-51 



0-4136 



0-2793 



0-2796 



0'0003 — 



The analyses of potassium hydroxide were made in the 

 same way as were those of barium hydroxide, and gave quite 

 similar results. They follow in Table II. 



Table II. 



N 



Analyses of — Potassium Hydroxide Solution. 



(By boiling in a trapped flask with an excess of iodine.) 

 Iodine 





KOH 



Iodine 



absorbed 



KOH 









taken. 



taken. 



by KOH. 



found 



Mean. 



Variation. 





cm 3 . 



grm. 



grm. 



grm. 



grm. 



grm. 



(0 



10 



0-20 



0-1621 



0-0716 



0-0717 



0001 — 



(2) 



10 



0-23 



0-1613 



0-0715 



0-0717 



0000.' — 



(3) 



15 



030 



0-2404 



0-1063 



01076 



0-0013 — 



(4) 



15 



0-30 



0-2429 



0-1074 



0-1076 



0-0002 — 



(5) 



15 



0-34 



0-2431 



0-1075 



1076 



0001 — 



(6) 



25 



0-51 



0-4089 



0-1808 



0-1792 



0-0016 + 



(7) 



25 



051 



0-4058 



01794 



01792 



0-0002 + 



The analyses by the modification of the Phelps method 

 were made by drawing into an Erlenmeyer beaker of convenient 

 size an approximately measured excess of deciuormal iodine, 

 and rapidly running the desired amount of alkali into it. The 



