Ferric Borate Formation in Aqueous Solution
Complexation, ferric borate, hydrolysis, iron(III), boric acid, potentiometry
Digital Object Identifier (DOI)
Potentiometric analyses indicate that previous investigations have overestimated the stability of ferric borate complexes. The FeB(OH) 2+4 formation constant result obtained in the present work isBβ *1 = [FeB(OH) 2+4 ][H+][Fe3+]-1[B(OH)3]-1 = (5.4±0.3) x 10-3 at 25.0°C and 0.7 molal ionic strength. Our result indicates that solution concentrations of FeOH2+ and FeB(OH) 2+4 are approximately equal in aqueous solution for boric acid concentrations on the order of 0.3 molal. Fe(B(OH)4) +2 is a minor species in solution compared to FeB(OH)4 2+ for conditions such that [B(OH)3][H+]-1≤ 350, and ferric borate complexation is insignificant in solutions such as seawater where [B(OH)3] ≤ 4× 10-4 molal.
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Citation / Publisher Attribution
Journal of Solution Chemistry, v. 26, p. 729-734
Scholar Commons Citation
Byrne, Robert H. and Thompson, Shannon W., "Ferric Borate Formation in Aqueous Solution" (1997). Marine Science Faculty Publications. 1712.