Durch Hydrolyse von Natriunipalladat(I1) entsteht Pd(OH)?, das durch Analyse, isobaren Abbau und Rontgenaufnahmen gekeiinzeichnet wird. Beim Kochen schmacli salpetersaurer Palladium(I1)-nitratlosungen bildet sich PdO -xH,O, das in einem verzerrten PdO-Gitter kristallisiert. Die Verzerrung des Gitters wird auf eine feste Losung von H,O ini Gitt,er des PdO zuriickgefuhrt. Die Gitterkonstanten von PdO werden neu bestimmt. zu a = 3,036 31 0,005 8; c = 5,337 0,005 A; cia = 1,753. Einigr Benlerliungen ziir Strnktnr des PdO werden beigefug t,.
A technique has recently been described by the authors for the automated thermometric analysis of solutions of medium to high concentrations of analyte, using a novel micro-scale flow cell with vigorous mechanical stirring. With this technique, fully automated analysis involving precipitation reactions is possible, using enthalpimetric principles. Coefficients of variation are better than f l . 0 per cent.In this paper, experiments are described that were carried out in order to define the limitations of this system, and the reasons for the improved performance compared with the many other types of thermometric analysers proposed in recent years are discussed.* The heat of dilution should, theoretically, be determined as a function of total ionic strength. This refinement, however, will have only a secondary effect and will not significantly alter the argument.
Vergleich der thermodynamischen Konsistenz verschiedener Modellanslitze fiir Aktivitlitskoeffizenten Anhand vorhandener experimenteller Daten der Gleichgewichte fest -flussig und flussiggasformig des Systems In-As wurde uberpriift, inwieweit die Modelle von BREBRICK und KRUPKOWSKI sowie die QCE-Naherung diese widerspruchsfrei beschreiben konnen. Das =UPHOWSKI-und daa BREBRICK-Modell sind a18 thermodynamisch konsistent einzuschiitzen. Aufgrund des einfaoheren Ansatzes sollte das KRupKowsgI-Modell bevorzugt angewendet werden.For investigations of the thermodynamic consistence of the KRUPKOWSKI and the BREBRICK models and of the QCE-approximation experimental data of the solid -liquid and liquid-vapour equilibria of the system In-As were used. The KRIJPKOWSKI and the BREB-RICK models are thought to be thermodynamically coneistent. Because it is less complex, the KRUPKOWSKI model should be used in favour.
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