Studies on the purities of precipitate and crystal(4)-The investigation or presumption of solubility by co-precipitation phenomena-

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  • Studies on the purities of precipitate and crystal 4 The investigation or presumption of solubility by co-precipitation phenomena

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<jats:title>Abstract</jats:title> <jats:p>The solubility of zinc oxalate has been reported by Kunschert (7×10−5 mol/l. at 25°) or F. Kohlrausch (4.2×10−5 at 18°), but, from the viewpoint of the relations between solubility and co-precipitation phenomena, it would be greater than their values, perhaps about 1.1∼1.6×10−4 mol/1. at room temperature.</jats:p> <jats:p>Measurements showed the solubility of zinc oxalate, of which composition was ZnC2O4·2H2O, to be 1.2×10−4 mol/l. at 20° ±0.05°. This is almost the same with the result obtained by Scholder, Gadene and Niemann (1.36×10−4 mol/l. as 18°) but further details are not clear.</jats:p> <jats:p>By the relations between solubility and co-precipitation phenomena, a presumption or investigation of solubility may be possible; namely, it may be determined by the use of the transition point of adsorption and occlusion of foreign ions (about 2×10−4 mol/l. at 20°). Needless to say, the formation or treatment of precipitate should be done under the same condition. The study on a mechanism for the adsorption or Balarew’s occlusion phenomena is in progress.</jats:p>

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