Ferric Borate Formation in Aqueous Solution

Authors

Robert H. Byrne, University of South FloridaFollow
Shannon W. Thompson, University of South Florida

Document Type

Article

Publication Date

1997

Keywords

Complexation, ferric borate, hydrolysis, iron(III), boric acid, potentiometry

Digital Object Identifier (DOI)

https://doi.org/10.1007/BF02767624

Abstract

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 is_Bβ ^*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.

Was this content written or created while at USF?

Yes

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.
https://digitalcommons.usf.edu/msc_facpub/1712