Complex equilibria in aqueous solutions of Ti3+–glycine and –malonic acid

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Abstract
The hydrolytic processes of Ti3+ and the equilibria of the Ti3+–glycine (HL) and –malonic acid (H2L′) systems were studied by pH-metry in aqueous solution (25 °C, I= 1.0 mol dm–3 KCl). It was demonstrated that more than one equilibrium model are suitable to interpret the hydrolytic reactions. In the Ti3+–glycine system the formation of complexes [TiHL]3+ and [TiL]2+ were identified; their stability constants are logβTiHL= 11.44 and logβTiL= 9.30. For the malonato complexes the following stepwise stability constants were determined: logK1= 6.83, logK2= 4.99, and logK3= 2.84. Some aspects of the equilibrium of Ti3+ are discussed.

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  • PSEQUAD
    Published by Springer Nature ,1985