Ferric Borate Formation in Aqueous Solution

Robert H. Byrne; Shannon W. Thompson

doi:10.1007/BF02767624

Ferric Borate Formation in Aqueous Solution

Robert H. Byrne, Shannon W. Thompson

College of Marine Science

Research output: Contribution to journal › Article › peer-review

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 _B β ^* ₁ = [FeB(OH) ²⁺ ₄ ][H ⁺ ][Fe ³⁺ ] ^-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 FeOH ²⁺ 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.

Original language	American English
Journal	Journal of Solution Chemistry
Volume	26
DOIs	https://doi.org/10.1007/BF02767624
State	Published - Jan 1 1997

Keywords

Complexation
ferric borate
hydrolysis
iron(III)
boric acid
potentiometry

Disciplines

Life Sciences

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https://doi.org/10.1007/BF02767624

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@article{5856b5427e25418a8ac50637190b76bb,

title = "Ferric Borate Formation in Aqueous Solution",

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 B β * 1 = [FeB(OH) 2+ 4 ][H + ][Fe 3+ ] -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 FeOH 2+ 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.",

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

author = "Byrne, {Robert H.} and Thompson, {Shannon W.}",

year = "1997",

month = jan,

day = "1",

doi = "10.1007/BF02767624",

language = "American English",

volume = "26",

journal = "Journal of Solution Chemistry",

}

TY - JOUR

T1 - Ferric Borate Formation in Aqueous Solution

AU - Byrne, Robert H.

AU - Thompson, Shannon W.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - 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 B β * 1 = [FeB(OH) 2+ 4 ][H + ][Fe 3+ ] -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 FeOH 2+ 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.

AB - 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 B β * 1 = [FeB(OH) 2+ 4 ][H + ][Fe 3+ ] -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 FeOH 2+ 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.

KW - Complexation

KW - ferric borate

KW - hydrolysis

KW - iron(III)

KW - boric acid

KW - potentiometry

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

UR - https://doi.org/10.1007/BF02767624

U2 - 10.1007/BF02767624

DO - 10.1007/BF02767624

M3 - Article

VL - 26

JO - Journal of Solution Chemistry

JF - Journal of Solution Chemistry

ER -

Ferric Borate Formation in Aqueous Solution

Abstract

Keywords

Disciplines

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