The hydrolytic processes of Ti³⁺ and the equilibria of the Ti³⁺â glycine (HL) and â malonic acid (H2Lâ ²) systems were studied by pH-metry in aqueous solution (25 °C, I= 1.0 mol dm^{â 3} KCl). It was demonstrated that more than one equilibrium model are suitable to interpret the hydrolytic reactions. In the Ti³⁺â 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: logK 1= 6.83, logK 2= 4.99, and logK 3= 2.84. Some aspects of the equilibrium of Ti³⁺ are discussed.