Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . y fraotioned the oldyttria into its components. 14) In 1867 Pattison and Clark dissolved a mixture of oerium, didymium, o and lanthanum oxides in chromio acid and heated to dryness at 110 . When theresidue was boiled with water the oerium remained behind as an insoluble re-sidue . 16 ) In 1875 Brauell used the method for the quantitative determination of oerium in cerite. ie) i7)loose in 1892 and Kruss and Loose in 1893 found that potassium ohromate aoted on the nitrate solutions in a twofold way. In the oold
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . y fraotioned the oldyttria into its components. 14) In 1867 Pattison and Clark dissolved a mixture of oerium, didymium, o and lanthanum oxides in chromio acid and heated to dryness at 110 . When theresidue was boiled with water the oerium remained behind as an insoluble re-sidue . 16 ) In 1875 Brauell used the method for the quantitative determination of oerium in cerite. ie) i7)loose in 1892 and Kruss and Loose in 1893 found that potassium ohromate aoted on the nitrate solutions in a twofold way. In the oold prin-cipally as a precipitating agent for the strong bases and in the hot as afraotionating agent for the weak bases. In the cold the didymium and in thehot the erbium oonoentrates in the precipitates. They prepared a didymiumearth (At. wt. ) by the precipitation of the crude didymium nitrate solu-tion with potassium chromate solution. is) In 1894 Brioout eleotrolized a weak aoid solution of ohromates ofcerite earths with volts. Cerium was oxidized and separated at the. -6- plus pole as a crystaline precipitate. 18) In 1896 Moissan and Stard fraotionated a sulphate solution with po-tassium ohromate to prepare pure yttria. ao) In 1897 Kaber found that when thorium nitrate was boiled with free ohromio acid or sodium diohromate that a beautiful orystalline preoipitate of Th(Cr 04 )2 * 3H2O was formed. Under these conditions oerium,.lanthanum and didymium gave no precipitate. 21) Muthmann and Bohm in 1900 were probably the first to obtain definite results from this method by fractionating a dilute solution of yttrium earth diohromates with a dilute solution of potassium ohromate as follows: 40 grams commercial yttria when mixed with 90 grams of ohromio acid dissolved with violent reaction in one liter of water. This was heated to boiling la a large retort and a stream of steam passed thru to keep the solution well stirred while a ten per oent. solution of potassium ohro
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