Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . ched. The following prooedure was tried. Small samples (generally .2 to .5 gr,oxide )were weighed in platinum oruoibles. The oxide was then oarefully moist-ened with water, and covered with pure hydroohlorio aoid, plaoed over a steambath, and proteoted from dust. When dissolved a slight excess of the calculat ed amount of dilute sulphuric aoid was added and evaporated to dryness. It o was then heated for four hours in an electric furnaoe at 500 , and prevent absorption of moisture from air by the a
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . ched. The following prooedure was tried. Small samples (generally .2 to .5 gr,oxide )were weighed in platinum oruoibles. The oxide was then oarefully moist-ened with water, and covered with pure hydroohlorio aoid, plaoed over a steambath, and proteoted from dust. When dissolved a slight excess of the calculat ed amount of dilute sulphuric aoid was added and evaporated to dryness. It o was then heated for four hours in an electric furnaoe at 500 , and prevent absorption of moisture from air by the anhydrous sulphate the oru-oibles were plaoed in weighing bottles while still hot and weighed when cold,first loosening the oovers for an instant to allow the air pressure to equal-ize. All weighings were made by the method of substitution, the tare being aplatinum crucible of same size and shape as the others and enclosed in a sim-ilar weighing bottle. The tare crucible was also placed in the furnace duringthe neatinte and in all respects was subjected to the same treatment as the. -14- orucibles containing the samples. The sulphates were finally treated withwater to determine if basic sulphate had been formed. The temperature of 0 0 0 Nos. 9 and 10 was held at 400 to 425 C instead of 500 C. The ratio used in calculating the atomio weights was: M + 24 wt. of oxide M + wt. of sulphate, where M is the atomio weight desired. All weights were correoted to vaouun.
Size: 1346px × 1857px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
