Iron(III) Hydrolysis and Solubility at 25 °C

2007/07/27 by Andri Stefánsson · 493 citations
Chemical Engineering · Chemistry · Energy · #Analytical Chemistry (journal) #Aqueous solution #Chemical and Physical Properties in Aqueous Solutions #Chemistry #Chromatography #Dilution #Electrochemical Analysis and Applications #Ferrihydrite #Hydrolysis #Hydrolysis constant #Inorganic chemistry #Ion #Ionic strength #Iron oxide chemistry and applications #Kinetics #Nuclear chemistry #Organic chemistry #Physical chemistry #Potentiometric titration #Reaction rate constant #Solubility #Solubility equilibrium #Thermodynamics #Titration

paper · doi:10.1021/es070174h

published in Environmental Science & Technology 41(17), 6117-6123 (American Chemical Society)

openalex publication_date 2007/07/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

UV-vis spectrophotometric measurements, potentiometric titrations, and solubility measurements were performed to evaluate the hydrolysis constants for aqueous Fe(III) and the solubility of 2-line ferrihydrite over a wide concentration range (0-3 M NaClO4 and p[H+] 1.54-11.23). From these measurements, Fe3+ was found to hydrolyze to form FeOH2+, Fe2(OH)24+, Fe(OH)2+, Fe(OH)3(0), and Fe(OH)4-. The hydrolysis and solubility constants of these species were determined together with their dependence on ionic strength. The iron (III) hydrolysis constants at infinity dilution were (logbeta(1,1) to logbeta(1,4) and logbeta(2,2))-2.19 +/- 0.02, -5.76 +/- 0.06, -14.30 +/- 0.32, -21.71 +/- 0.24, and -2.92 +/- 0.02, respectively. The solubility product for 2-line ferrihydrite was (logK(s,0)) +3.50 +/- 0.20. The results have been compared with literature values.

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