Eisen: Teil B — Lieferung 3: Verbindungen Eisen und by Leopold Gmelin

By Leopold Gmelin

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Extra resources for Eisen: Teil B — Lieferung 3: Verbindungen Eisen und Kohlenstoff (Fortsetzung)

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Ure unter Bildg. lt, fast vollstandig gelOst wird, ist die gelbe Modifikation darin fast unlosl. In verd. ngig vom Fe20 a-Gehalt, gelbe bis dunkeIrote, die gelbe Form gelbe bis griinlichgelbe Hydrosole, A. KRAUSE (Z. anorg. Ch. 17. [1928] 153). Physical Properties Physikalische Eigenschaften der wilBrigen LOsung. Wie aus den in der Literatur vorliegenden Messungen physikal. Eigenschaften der wss. Lsgg_ von Eisen(III)-acetaten hervorgeht, andert sich der Zustand solcher Lsgg. mit der Zeit. Es findet Spaltung in kolJoides Hydroxyd und Essigsaure statt, die irreversibel ist.

Beschleunigt, durch einen groBen 1JberschuB einer der beiden ReaktionsteiInehmer verzogert. Geschwindigkeitskonstante k in Abhangigkeit von der Temp. 25 Mol HaCzO, enthalt: t . • . 5° 100° 97° 94° 85° 70° 62° 49° 40° k. . . 000014 Die Konstante hat fiir jede Verd. einen anderen Wert. , G. LEMOINE (Ann. Chim. Phys. [6] 30 [1893] 289). Basische Eisen(III)-o:Ealate. Die Existenz definierter Verbb. ist fraglich. J. M. EDER, E. 1 [1880] 764) beschreiben die Darst. einer rotbraunen Verb. Fea(CzO')3 -2 Fe (OHk4HzO (bei 100° getrocknet) und eine durch Hydrolyse daraus entstehende gelbbraune in HzO unlOs1.

Wird die Absorption im violetten Teil geschwacht, im roten verstarkt, O. SCARPA (Z. Ch. Ind. Koll. II [1908] Suppl. II 50). - Die Farbanderung ist keinesfalls proportional der Schichtdicke, so daBeine colorimetr. Best. des Fe-Gehaltes von Acetatlsgg. unmogIich ist, J. RIBAN (El. Soc. chim. [3] 8 [1891] 919). Die farbende Wrkg. des Zusatzes von Essigsaure zu einer Lsg. von NH,Fe(SO,h erhoht sich nicht proportional dem Zusatze, A. MULLER (J. pro Ch. 98 [1865] 340). - Extinktionskoeffizienten der Mischungen von FeCI a und Essigsaure im Ultraviolett s.

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