Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . he best material (VTIIn, VIIIi2,VHIig, VIII14, Vis and Vila) were oombined and purified as follows: The oxide was dissolved in pure oommeroial hydroohlorio acid and preoip-itated as oxalate with pure commercial oxalic acid and washed until all tracesof chromium were removed. After ignition in platinum dishes in an electricoven the oxide was again dissolved in hydroohlorio aoid and a portion of thesolution tested with hydrogen sulphide. No precipitate was formed so thesolution was diluted considerably and satu
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . he best material (VTIIn, VIIIi2,VHIig, VIII14, Vis and Vila) were oombined and purified as follows: The oxide was dissolved in pure oommeroial hydroohlorio acid and preoip-itated as oxalate with pure commercial oxalic acid and washed until all tracesof chromium were removed. After ignition in platinum dishes in an electricoven the oxide was again dissolved in hydroohlorio aoid and a portion of thesolution tested with hydrogen sulphide. No precipitate was formed so thesolution was diluted considerably and saturated with potassium sulphate, anexoess of the solid being added. After standing a week only a slight cloudi-ness had developed and the solution was filtered until perfectly clear andammonia water added in exoess. After digesting on the steam bath for an hourwith the occasional addition of more ammonia to prevent the solution of thehydroxide, it was washed until all but traoes of the alkali or alkaline earth?were removed. The hydroxide was dissolved in pure aoid and repreoipitated. -13- as oxalate, thoroughly washed, dried arid ignited in platinum dishes as oxide was again redissolved and repreoiritated,especial oare being takento exclude dust. This precipitation was done with recrystalized oxalic aoid,then thoroughly washed and ignited in the electric oven at as low a tempera-ture as possible to prevent possible contamination from the platinum earth was now considered to be free from the oommon metals. RATIO OF OXIDE TO SULPHATE. It seemed probable that if a set of conditions were selected whioh would give the most probable value for the atomio weight and these conditions were followed ir. each oase a set of relative values would be obtained which would demonstrate the course of a fractionation even if not giving absolute o) Wild states that all traoes of aoid were not expelled until a tempera-o ture 450-500 C was reached. The following prooedur
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
