Abstract
Two methods are described for the separation of the alkali metals and magnesium. In the first method magnesium is separated from the other metals by precipitation as MgCO3 · (NH4)2CO3 in an ethanolic medium and is detected with Titan Yellow. Lithium is separated from sodium and potassium by virtue of the solubility of LiCl in a di-ethylether/ethanol medium, and is detected by means of potassium periodate. Sodium is detected by formation of the triple acetate with copper uranyl acetate reagent. Potassium is detected by the formation of insoluble potassium cobaltinitrite. In the second method, potassium is tested for separately on the sodium carbonate extract prepared for anion tests. Magnesium is separated as in method 1 and lithium and sodium are tested for after partial removal of the ethanol. The first method has the advantage of using successive separations but the second method is to be preferred on the grounds of speed and is recommended.
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