Ionic strength dependence of formation constants—XVIII. The hydrolysis of iron(III) in aqueous KNO3 solutions

Daniele, Pier Giuseppe; Rigano, Carmelo; Sammartano, Silvio; Zelano, Vincenzo

doi:10.1016/0039-9140(94)e0081-2

Cited by 55 publications

(45 citation statements)

References 9 publications

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“…The absorbance of the Fe(III)-H 2 bbpen solution was maximum and constant in the pH range 2.0 − 3.0. The decrease of the absorbance in lower pH seems to be originated from the protonation of H 2 bbpen [9,10], and the slight decrease in higher pH may be caused by the hydrolysis of Fe(III) [11,12]. Since the shape of the absorption spectrum was not influenced by any of pH and concentrations of Fe(III) and H 2 bbpen, it was found that single species is concerned in the coloration.…”

Section: Standard Proceduresmentioning

confidence: 84%

“…On pH < 2, the hydrolysis of Fe 3+ is negligible [11,12] and H 2 bbpen is converted to H 4 bbpen 2+ [9,10]. Therefore, the complexation equilibrium and its equilibrium constant (K) in this condition can be expressed as follows: The absorbance reached maximum value within 100 min at 20 °C, which was shortened to 5 min by warming the solution using a water bath at 50 °C.…”

Section: Standard Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamine

et al. 1998

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Section: Standard Proceduresmentioning

confidence: 84%

Section: Standard Proceduresmentioning

confidence: 99%

Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamine

et al. 1998

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“…At the present time, only limited literature data (Byrne et al 2005;Kester 1976a, b, 1978;Liu and Millero 1999;Daniele et al 1998;Baes and Mesmer 1976) are available for the hydrolysis constants b* 2 , b* 3 , and b* 4 for the formation of Fe(OH) 2 ? , Fe(OH) 3 0 , and Fe(OH) 4 -in NaCl or other media.…”

Section: Speciation Of Fe(iii) In Brinesmentioning

confidence: 98%

“…A number of measurements Byrne et al 2005;Millero 1999, 2002;Daniele et al 1998;Byrne and Kester 1976a, b, 1978, 1981Baes and Mesmer 1976, to name a few) have been made on the stability constants for the hydrolysis of Fe 3? represented by the equilibria:…”

Section: Speciation Of Fe(iii) In Brinesmentioning

confidence: 99%

Thermodynamic and Kinetic Properties of Natural Brines

Millero

2008

Aquat Geochem

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The physical chemistry of natural brines made up of mostly NaCl has been studied over the years. In this article, the work on the thermodynamics and kinetics of processes in NaCl brines will be examined. The importance of ionic interactions of the processes will be stressed. This will include the pressure-volume-temperature and physicalchemical properties of NaCl and other brine salts from 0 to 6 m, 0 to 200°C, and 0 to 1,000 bar applied pressures. Acid-base, gas-liquid, solid-liquid, and ion-complex formation processes in NaCl are examined. Equations that can be used to estimate the equilibria in NaCl are given. Pitzer models are discussed that can be used to estimate ionic equilibria in brines. The oxidation of Fe(II) and Cu(I) with O 2 and H 2 O 2 and the reduction of Cu(II) with H 2 O 2 in NaCl are examined in terms of ionic complexes of metals with OHand CO 3 2-. The oxidation of H 2 S with O 2 and H 2 O 2 is also examined in NaCl media. Equations are given that can be used to estimate the effect of ionic interactions on kinetic processes in NaCl.

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“…Deviations from the Debye-Hückel equation can be accounted for by a term linear in the ionic strength, by ion association or by both phenomena taken together. The dependence of the dissociation and stability constants on ionic strength, according to the EDH model, can be represented using the following equation [18][19][20]:…”

Section: Ionic Strength Dependence Of the Dissociation And Stability mentioning

confidence: 99%

Complexation of Dioxovanadium(V) with D-(-)-Quinic Acid at Different Ionic Strengths Using Different Models Based on the Debye-Hückel Theory

Majlesi

Rezaienejad

2011

J Solution Chem

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The complex formation reaction between the dioxovanadium(V) cation VO + 2 and D-(-)-quinic acid {(1R,3R,4S,5R)-(-)-1,3,4,5-tetrahydroxycyclohexane-1-carboxylic acid} has been studied in aqueous solutions. The UV data and the values of the derived conditional stability constants are presented and discussed in the light of one stoichiometric model for the reaction at T = 298 K and different ionic strengths (0.10 to 1.00) mol·dm −3 of sodium chloride. Speciation diagrams and dissociation constants were obtained on the basis of UV spectroscopic measurements and potentiometric titrations, respectively. Our results show that one complex species, VO 2 L, exists in solution in the pH range of about 1.00 to 3.00. The parabolic, Specific Ion Interaction Theory (SIT), and extended Debye-Hückel type (EDH) models successfully describe the ionic strength dependence of the stability constants. A comparison with literature data is also reported.

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Ionic strength dependence of formation constants—XVIII. The hydrolysis of iron(III) in aqueous KNO3 solutions

Cited by 55 publications

References 9 publications

Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamine

Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamine

Thermodynamic and Kinetic Properties of Natural Brines

Complexation of Dioxovanadium(V) with D-(-)-Quinic Acid at Different Ionic Strengths Using Different Models Based on the Debye-Hückel Theory

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