Speciation of Al3+ in fairly concentrated solutions (20–200 mmol L−1) at I=1 mol L−1 (NaNO3), in the acidic pH range, at different temperatures

Cigala, Rosalia Maria; Stefano, Concetta De; Giacalone, Alba; Gianguzza, Antonio

doi:10.3184/095422911x12971889727358

Cited by 14 publications

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“…The hydrolysis of Al 3+ and CH 3 Sn 3+ was already studied in these laboratories, , and the constants relative to the equilibria and are reported in Table . These hydrolysis constants were determined in rather high metal concentration conditions, , to find the formation of high homopolynuclear species, that means, for mixed metal solutions, high probability for the formation of heterometal hydrolytic species.…”

Section: Resultsmentioning

confidence: 99%

“…To minimize systematic errors and to check the repeatability of the measurements, the Al 3+ /CH 3 Sn 3+ measurements were carried out by two operators, using two different experimental systems, as already described in refs and .…”

Section: Methodsmentioning

confidence: 99%

“…■ EXPERIMENTAL SECTION Chemicals. The aluminum(III) solutions were prepared and standardized as already reported in ref 28. Monomethyltin(IV) solutions were prepared by weighing trichloride salt (purchased by Aldrich), with a purity > 99 %, used without further purification.…”

Section: +mentioning

confidence: 99%

“…As well-known, three-charged cations show a high tendency to form highly polynuclear hydrolytic species (e.g., Fe 12 (OH) 34 2+ , Al 13 (OH) 32 7+ ), − and the possibility, in a mixture of trivalent cations, of mixed metal species formation can be easily predicted.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al³⁺/CH₃Sn³⁺ Mixtures

et al. 2013

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The hydrolysis of mixed-metal cations (Al 3+ /CH 3 Sn 3+ ) was studied in aqueous solutions of NaNO 3 , at I = 1.00 ± 0.05 mol·dm −3 and T = 298.15 K, by potentiometric technique. Several hydrolytic mixed species are formed in this mixed system, namely, Al p (CH 3 Sn) q (OH) r with (p, q, r) ). The stability of these species, expressed by the equilibrium:OH , can be modeled by the empirical relationship: log β pqr OH = −3.34 + 2.67p + 9.23(q + r). By using the equilibrium constant X pqr relative to the formation reaction: pAl (p+q) (OH) r + q(CH 3 Sn) (p+q) (OH) r = (p + q)Al p (CH 3 Sn) q (OH) r , it was found that the formation of heterometal mixed species is thermodynamically favored, and the extra stability can be expressed as a function of the difference in the stability of parent homometal species. This leads, in turn, to a significant enhancement of hydrolysis and solubility.We thank the Universities of Messina and Palermo for partial financial support. Figure 3. Plot of −log[Al 3+ ] vs pH at different [CH 3 Sn 3+ ] T concentrations, when [Al 3+ ] T = 50 mmol·dm −3 ; [CH 3 Sn 3+ ] T = 0, full line; [CH 3 Sn 3+ ] T = 50 mmol·dm −3 , dashed line; [CH 3 Sn 3+ ] T = 100 mmol·dm −3 , dotted line. Journal of Chemical & Engineering Data Article dx.doi.org/10.1021/je400003r | J. Chem. Eng. Data 2013, 58, 821−826

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al³⁺/CH₃Sn³⁺ Mixtures

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“…The knowledge of accurate values of hydrolysis constants of Al 3+ is of crucial importance for the studies on speciation of natural systems, such as natural waters and biological fluids. Al 3+ hydrolysis has relatively been studied, especially in NaCl, KCl, and NaClO 4 and, to a lesser extent, in LiCl, NaNO 3 , Ba(NO 3 ) 2 ionic media, though not systematically in a wide range of ionic strengths [2,[5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Hydrolysis of Al3+ in Aqueous Solutions: Experiments and Ab Initio Simulations

Giacobello

Nardo

Foti

et al. 2022

Liquids

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An experimental and computational study on the hydrolysis of Al3+ in aqueous solutions is here reported. Speciation model and formation constants were determined by potentiometric titrations at T = 298.15 K, 0.1 ≤ I/mol L−1 ≤ 1 in aqueous NaCl, NaNO3, NaCl/NaNO3 solutions. The dependence of formation constants on ionic strength is reported in all the ionic media over the range of 0.1–1.0 mol L−1. Under the studied experimental conditions, the formation of Al3(OH)45+ and Al13(OH)327+ species is observed in all the investigated ionic media and ionic strengths. The formation constants of the species formed by Al3+ with Cl− were determined together with the dependence on the ionic strength. Moreover, with the aim of unveiling the molecular structure of the formed Al complexes, quantum-mechanical calculations and state-of-the-art ab initio molecular dynamics simulations under explicit solvation were executed. These computations show, for the first time, the highly cooperative role played by the surrounding water molecules in neutralising mononuclear systems–such as AlCl2+ and AlClOH+–and the hydrolytic polynuclear system, Al3(OH)45+.

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Modelling the Hydrolysis of Mixed Mono-, Di- and Trimethyltin(IV) Complexes in Aqueous Solutions

et al. 2015

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Speciation of Al³⁺ in fairly concentrated solutions (20–200 mmol L⁻¹) at I=1 mol L⁻¹ (NaNO₃), in the acidic pH range, at different temperatures

Cited by 14 publications

References 1 publication

Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al³⁺/CH₃Sn³⁺ Mixtures

Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al³⁺/CH₃Sn³⁺ Mixtures

Hydrolysis of Al3+ in Aqueous Solutions: Experiments and Ab Initio Simulations

Modelling the Hydrolysis of Mixed Mono-, Di- and Trimethyltin(IV) Complexes in Aqueous Solutions

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Speciation of Al3+ in fairly concentrated solutions (20–200 mmol L−1) at I=1 mol L−1 (NaNO3), in the acidic pH range, at different temperatures

Cited by 14 publications

References 1 publication

Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al3+/CH3Sn3+ Mixtures

Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al3+/CH3Sn3+ Mixtures

Hydrolysis of Al3+ in Aqueous Solutions: Experiments and Ab Initio Simulations

Modelling the Hydrolysis of Mixed Mono-, Di- and Trimethyltin(IV) Complexes in Aqueous Solutions

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Speciation of Al³⁺ in fairly concentrated solutions (20–200 mmol L⁻¹) at I=1 mol L⁻¹ (NaNO₃), in the acidic pH range, at different temperatures

Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al³⁺/CH₃Sn³⁺ Mixtures

Enhancement of Hydrolysis through the Formation of Mixed Heterometal Species: Al³⁺/CH₃Sn³⁺ Mixtures