Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . e, in one literof water and adding to this solution a silver nitrate solution prepared asfollows :- A quantity of silver equivalent to the yttrium chloride to within a veryfew tenths of a milligram (assuming the at. wt. Y = 89) was weighed out anddissolved in pure nitric acid (sp. gr. ) which had been redistilled fromquartz apparatus. Enough acid was added so that an excess remained. The re-action was carried out in a liter (Jena) Erlenmeyer flask fitted with aoolumn of bulbs to retain spray. When the
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . e, in one literof water and adding to this solution a silver nitrate solution prepared asfollows :- A quantity of silver equivalent to the yttrium chloride to within a veryfew tenths of a milligram (assuming the at. wt. Y = 89) was weighed out anddissolved in pure nitric acid (sp. gr. ) which had been redistilled fromquartz apparatus. Enough acid was added so that an excess remained. The re-action was carried out in a liter (Jena) Erlenmeyer flask fitted with aoolumn of bulbs to retain spray. When the silver was entirely dissolved somewater was added and the solution gently boiled to remove nitrogen oxide fumesIt was then diluted to one liter and added very slowly to the ohloride solu-tion. The flask was storrered and contents well shaken with a rotary motionand allowed to stand a few days. Small samples were then removed and testedfor an exoess of silver or ohloride ion. In every case the silver ion wasfound in large exoess, although the solution was allowed to stand in a dark. -20- place for a week and in some cases it was heated on the steam bath for sever-al hours to bring about complete equilibrium. Another determination was attempted assuming the atomic weight of thematerial to be 90, but in this oase also considerable excess of silver ionwas found. These results were evidently caused by one of three possibilities: 1. Adsorption of the molecular yttrium, chloride by the silver seemed improbable since rather dilute solutions were used and the silvernitrate solution was added very slowly to the yttrium chloride solution, alsothe fact that the solution was allowed to stand long enough for most of theoooiuded yttrium chloride to oome back into solution. 2. That yttrium chloride may not be completely ionized under these con-ditions. Lack of time has prevented the confirmation or disproval of thispossibility in the present investigation. 3. The atomic weight of
Size: 1346px × 1857px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
