Abstract
AbstractBy a determination of the water of crystallization in the triple acetates of Na, Mg and UO2 (Blanchetière) or Na, Zn and UO2 (Barber and Kolthoff), it has been found that six molecules of water of crystallization are taken up with an unmeasurably small vapour‐pressure and that these 6 H2O are present as “facultative water of crystallization”. In addition yet a 7th molecule of water is taken up as a “zeolithic increment”. Consequently the weight of the triple acetates in the air‐dried state can still fluctuate by about 0.25%.Kahane's triple acetate was found to contain not 8 H2O but about 5 H2O and in addition about 1.5 mol. ethylalcohol. It is stable in air up to 110° and shows a very small zeolithic increment.The alcohol content of the liquid can vary in the precipitation between 30 and 60%, without the content of “volatile matter” (sum of water and alcohol) in the crystals varying more than 0.2%.Into the anhydrous sodium magnesium uranyl triple acetate 4 molecules of ethyl alcohol can be introduced artificially; they are taken up without any noticeable vapour‐pressure but are readily replaced by H2O.
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