,' in ami 'am of Iodim in Haloid Salts. 



L99 



0-0002 grm. Ir Bhould be recalled, too, in this connection that 

 the results of Series ! pointed to increasing volatility of the 

 arsenic with the increase of the sodium chloride present. 



Series L. 





[l.-lj. 



II.K CL KBr. 



(1) 20 cm' 



(2) 20 

 20 



20 



20 



20 



20 

 (9) 20 



20 

 (11) 20 



20 

 (13) 20 

 (U> 20 



(16) 20 

 <16) 20 



(17) 20 



(18) 20 



(19) 20 

 20 

 20 

 20 



(23) 20 



(24) 20 



(25) 20 



(26) 20 



irrni. 



0-3 

 05 

 0-5 

 0-5 

 0-5 

 0-5 



05 

 0-5 

 0-5 



0-5 

 05 

 05 

 0-5 

 05 

 0-5 

 05 

 0-5 

 05 

 0-5 



Final 

 vol. 



."..") cm' 



35 



: ; .") 



35 



35 



35 



35 



35 



35 



35 



35 



35 

 35 



35 

 35 

 35 

 35 

 35 

 35 

 35 

 35 

 35 

 35 

 35 

 35 



KI 

 taken. 



crrni. 

 ii 5616 

 ii |630 

 0-5622 

 0*0506 

 0*0506 

 00506 

 0*0506 

 0*0051 

 00051 

 0*561 I 

 0*5619 

 0*5624 

 0*0506 

 0-0506 

 0*0051 

 0-0051 

 0*5619 

 0-5697 

 0-5622 

 0-0506 

 0-0506 

 0-0051 

 0-0051 

 0-5626 

 0-5660 

 0-5622 



Theory 



for 

 [odine. 



grm. 

 0*4080 



(l-l()!H 

 0*4083 

 0*0400 

 0*040Q 

 0*0400 

 0-0400 

 0-0040 

 (i Ohio 

 0-4H77 

 Q-4082 

 04086 

 00400 

 0-0400 

 0-0040 

 00040 

 0*4082 

 0-4138 

 0-4083 

 0-0400 

 00400 

 0-0040 

 0-0040 

 0-4087 

 0-4112 

 0-4083 



Iodine 

 found. 



Error. 



Average 

 error. 



»rm. 

 0*4079 

 0*4086 

 04086 

 00396 

 0*0391 

 00400 

 0-0401 



0*0037 



DOOMS 



0*4066 



04073 

 0-4073 

 0-0402 

 0-0395 

 0-0037 

 0-0037 

 0-4092 

 0-4130 

 04099 

 0-0410 

 0-0404 

 0-0048 

 0-0049 

 0-4083 

 0-4111 

 0-4079 



gran. 



grm. 

 0*0001 — 

 0*0005— 



00003 • 

 0*0004— 

 0-0009— y 00002 — 



o-oooo 



0001 + 

 00003— 

 00002— 

 0*0011 — 

 0*0009 

 0-0013- 

 0-0002 + 

 0-0005 — 

 0-0003 — 

 0-0003 — 

 0-0010 + 



0-0002— y o 



0-0016 + 

 0-0010+ s 



00004 + 



-I 



ill 



o-ooii — 



0-0002 — 



0-0008+ \ 

 0009+ J 

 0-0004- 

 0-0001 — 

 0-0004 — ! 



00008 + 



0-0003- 



The presence of potassium bromide results in the liberation 

 of minute amounts of bromine and a consequent increase in the 

 arsenions oxide and apparent excess of iodine. The mean error 

 due to this cause is 0*0008 grm. for 0'5 arm. of the bromide, 

 and the variation in the quantity of iodide present is without 

 effect upon it. 



The simultaneous action of the chloride and bromide tends, 

 of course, to neutralize the error due to each. Thus, in the 

 mixture weighing about 1*5 grm. and consisting of sodium 

 chloride, potassium bromide, and potassium iodide in equal 

 parts, the mean error amounts to 0*0003 grm. — . The largest 

 error in the series is 0*0016 grm. +. when the bromide was at 

 it- maximum and no chloride was present; and the next largest 

 was 0"0013 grm. — when the chloride was at its maximum and 

 no bromide was present. 



It is obvious that when the amounts of chloride and bromide 

 present are known approximately it is possible to apply correc- 

 Am. Jocr. Scl— Third Vol. XXXIX, No. 231 —March, 1890. 



14 



