Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . ) yttrium-hoImium fractionsfrom a brornate series. Oxalate white but oxide was light brown. Two 175 gramportions were taken and mixed with 370 grams ohrornic acid each. 500 co. ohromate solution wer? used in each fraction. IV. Yttrium-erbium earth (average at. wt. ) from the brornate fraction-ation. 265 grams were mixed with double weight of ohromio aoid and dividedinto two flasks for the run. 500 oc. ohromate solution were used for eaohfract ion. V. Xenotime earth (average at. wt. ), last fractio
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . ) yttrium-hoImium fractionsfrom a brornate series. Oxalate white but oxide was light brown. Two 175 gramportions were taken and mixed with 370 grams ohrornic acid each. 500 co. ohromate solution wer? used in each fraction. IV. Yttrium-erbium earth (average at. wt. ) from the brornate fraction-ation. 265 grams were mixed with double weight of ohromio aoid and dividedinto two flasks for the run. 500 oc. ohromate solution were used for eaohfract ion. V. Xenotime earth (average at. wt. ), last fractions from the samesouroe as Nos. I and II, Slight speotra, color almost white. 190 grams ofthe oxide were mixed with 380 grams of chromic acid and fraotionated in twoflasks. VI. 288 grams of oxide (average at. wt. ) obtained from colorlessfractions of the brornate series were mixed with 725 grams of ohrornic acid anddivided in two flasks. 500 co. of ten per cent, ohromate solution were addedfor eaoh fraction except No. 2 whioh was obtained by evaporating solutionsdown to •9- VII. Source of material was the same as for No. VI, Taut the process wascarried out according to a method suggested by Professor C. James in a pri-vate communication. 144- grams of oxide were dissolved in nitric acid to a neutral solution and potassium diohromate added, diluted to four with liters and fraotionated 500 cc. of ohromate solution as The following fractions from the above series were combined: FractionIllio IVeIVeIV7 Weight Atnmio Weight S grams 212621 75 149 90, (calculated) (determined) The combined oxide was mixed with 390 grams of chromic aoid and 250 oo. often per oent. ohromate solution per fraction,except the last four in which500 co. were used.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
