Abstract
Hydrolytic equilibria of the aluminum(III) ion were studied in the presence of a surfactant, sodium n-dodecylsulfate (SDS) and, separately, in mixed water + dioxane and water + dioxane + surfactant media at 298.15 K, by using potentiometric measurements with a glass electrode. The concentration of SDS was between 1.25 and 25.0 mmol-dm−3, whereas the volume percent of dioxane was varied from 10 to 50. The supporting strong electrolyte was 0.1 mol-dm−3 LiCl. A general least-squares treatment of the data indicates the formation of mononuclear hydrolytic complexes of the form Al(OH) m 3 − m (m = 1–3) at all studied compositions. At lower concentrations of SDS (≤ 12.5 mmol-dm−3) it was necessary to include polynuclear hydrolytic complexes in the hydrolytic model. On increasing the concentration of SDS, the formation of polynuclear complexes is suppressed, and at the SDS concentration of 25.0 mmol-dm−3, only Al(OH)2+ and Al(OH)2 + are observed in solution. At lower volume percentages of dioxane, the speciation involved polynuclear complexes in addition to mononuclear complexes. At dioxane concentrations higher than 20 vol% only mononuclear complexes are formed. The simultaneous presence of the SDS and dioxane as ionic medium modifiers produces only the mononuclear complexes Al(OH)2+ and Al(OH)2 +, which have significantly higher stability constants than in the pure ionic medium.
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Jelić, R.M., Joksović, L.G. & Djurdjević, P.T. Potentiometric Study of the Effect of Sodium Dodecylsulfate and Dioxane on the Hydrolysis of the Aluminum(III) Ion. J Solution Chem 34, 1235–1261 (2005). https://doi.org/10.1007/s10953-005-8016-y
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DOI: https://doi.org/10.1007/s10953-005-8016-y