206 HINRICHS— ATOMIC WEIGHT OF VANADIUM. [April 21, 



Prandtl and Blcycr.^ Series I., 1909. 



No. I. 2. 



Oxychlor. 5.5 5.9 



r = 0.40 393 346 



e=^ 91 44 



Range: 71. — Diagram: Line L. 



"Clarke, " Recalc," 1910. p. 307 for I. and II.; Jouni. Am. Chem. Soc, 

 191 1, p. 266, for III. 



Reaction No. 311.— Atomic Ratio. 7? = 0.47951. 

 Edgar F. Sinitli and McAdam, Jour. Am. Chciii. Soc, 1910, p. 1614. 

 No. I. 2. 



Vanadate 4.9 5.6 



/• = o.47 931 927 



f = — 20 — 24 



Range : 20. — Diagram : Line Q. 



Strictly this series consists of 3 determinations only, two of 



which have been made twice, as follows : 



Range: 15. 



This shows how even within narrow limits of weights taken 

 (here from 41^2 to 9% grammes) the systematic error becomes evi- 

 dent as a function of the weight taken. Within the actual range, 

 the analytical excess approaches zero with diminishing amount 

 operated upon. 



Preliminary Work. 



.•Analytical 

 Reac- Ratio. Excess. 



Line. tion. r. e. 



A. a I det. 1.6385 oxychl. gave 0.874 oxide 0.53342 892 Berzelius. 



E. 4 det. 4.0418 2.1258 0.52608 158 Roscoe. 



D. b I det. 0.351 pentoxide 0.913 Ba sulphate 0.38445 —527 Berzelius. 



T. c I det. 0.351 pentoxide from 0.775 Va sulphate 0.45290 + 432 Berzelius. 



