The Journal of the American Chemical Society VQL, 47 l&HnunmoN
FEBRUARY, 1825
No. 2
nroY THS CHSMlCAL m l ' Q l U n S OF M E uNXVER!Ul'Y 01 NEW
HI-
SOLUBIt/TIESOFIUR&RAR"HSdLTS PART I BYMARIOND.Wnunus, € C. I. Fooc AJUD C.JAMSS R o r m v t l ~MAY10.1924
PUmrr*+r, F S D S U A 8 Y 5.1925
I t hasbem sbrrnn that the f d d m y s t a n h h ofthe c h l e o f yttrium d bdmimn frmn 1:l hydrochlaic acid causes the hdmium to concentrate rrrtber rrrpidDy m the kast soluble portians.* Because the separation of these eknteats from each dher is very difficult, it was amsidered that a amfd study of tbe solubility d the chtorides might reveal stmestrildngcharactctlstrc ' availoMefarthe~ticmdcertaiamembers ofthe~scries. PrepurtiandChbn'dca-The chlorides were prepared by dissolving the highly puiified asides m hydrochtaie d, evaparating the salutioas to the point of crystrrtlization, coaling m ice and saturating with he+ gen chloride. The crystafswere scparatiedasmuchaspossiblefrom adhering mqtber liquor by suctia~and washed with hydrochtoric a d previously saturated with hydrogen drfaride. whenever wcessary, the CbkKidCs were submitted to a dctpystallitation. In order toobtain themost efficient drying, it was found that the vacuum
d&ccator&ouldmtcrinbdhsulfurkacidandsodiumhyrirmtideand that the crystals should be stirred at f r q m t intervals to prevent caking. The greatest care wa!3 taken in this procedm to dry the d t thmughly d yet prevent dehydrption. When the process was considaed compkte, a carehl analysis was employed as a check. Determinaths were m& of the dubilit.jes ob the hexahydrated trichkKides of yttrium, d w n and neodymium in water and in hydrochloric acid of d. 1.1051, and of I
Tars JOURNAL, 43,1398 (1921).
298
MARION D. WILLIAMS, H. C. FOGG AND C. JAMES
VOl. 47
ytterbium in the latter solvent. In order to obtain fairly representative curves, determinations were made a t loo, 20°, 30°, 40' and 50'. The samples for the thermostat were made up in the usual manner. Before the bottles were sealed, they were brought to either slightly above, or slightly below, the temperature a t which the determination was to be made TABLE I SOLURILITIGS ,
