The state of iron(III)‐hydroxide in aqueous solutions of very low concentrations has been investigated using ^59^Fe as tracer. From very dilute solutions (10^−5^ M, 10^−7^ M and 10^−9^ M) brought to a pH between ∼ 5–12 practically all the iron hydroxide can be sedimented by ultracentrifugation. The
Die Ermittlung der Löslichkeit von Eisen(III)-hydroxiden mit 59Fe I Fällungs- und Auflösungsversuche
✍ Scribed by H. Lengweiler; W. Buser; W. Feitknecht
- Publisher
- John Wiley and Sons
- Year
- 1961
- Tongue
- German
- Weight
- 686 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
The total solubility of amorphous Fe^III^‐hydroxide and α‐FeOOH in 3M NaClO~4~ has been determined using ^59^Fe as tracer. The solubility determination of the amorphous hydroxide extended over the pH‐range 3–14. At pH < 3.5 the results agree satisfactorily with the value calculated using the solubility‐product and the constants of hydrolysis. At pH 5–12 an average solubility of ∼ 10^−7^ M has been measured but the results show considerable fluctuations. Therefore a colloidal solubility has been assumed. In the alkaline range pH > 12 it could be shown that the equilibrium Fe(OH)~3~ + OH^−^⇆Fe(OH) is established, the following pK~S4~ being found to be after 2 h ageing 4.50 ± 0.15 and after 96 h ageing 5.00 ± 0.15.
📜 SIMILAR VOLUMES
## Abstract The solubility of aged iron(III) hydroxide precipitates was investigated by determining [Fe^3+^] and [H^+^] of solutions in contact with the solid phases. [Fe^3+^] and [H^+^] were measured by the EMF.‐method at the constant ionic strength 3M (Na)C10~4~. The precipitates were investigate