Studies on the Hydrolytic Polymerization of Chromium (Ⅲ) Ion(Ⅹ) --Graphing Analysis and Computer Screening for Determination of Hydrolysis Model

Abstract

Abstract: The hydrolytic polymerization state of Cr³⁺ was studied in the presence of maleic acid by equilibrium pHmethod at 60℃ and constant ionic strength with total concentration of Cr³⁺ to be 0. 0080mol·dm^-3 and that of maleic acid to be 0.0100, 0.0120, 0.0140mol·dm^-3 respectively. Preliminary estimation for composition of the system was made by graphing integration and then precise calculation was made by pqr analysis on the basis of the former. Results showed that the present system is composed of [Cr(OH)A],[Cr₂(OH)A]³⁺ ,[Cr₂(OH)A₂]⁺ and a small amount of [CrA₂]^-,and is more complicated than 1:1 system.The equilibrium constants of twelve reactions were obtained by calculating thirty one data points with good fitting. Comparison between the present system and that with fumaric acid was made.

Key words: Chromium, Hydrolysis, polymerization, Maleic acid, Equilibrium constemt

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Luo Qinhui, Shen Mengchang, Ren Jianguo, Ding Yi, Dai Anbang . Studies on the Hydrolytic Polymerization of Chromium (Ⅲ) Ion(Ⅹ) --Graphing Analysis and Computer Screening for Determination of Hydrolysis Model[J]. Chem. J. Chinese Universities, 1988, 9(12): 1211.

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Studies on the Hydrolytic Polymerization of Chromium (Ⅲ) Ion(Ⅹ) --Graphing Analysis and Computer Screening for Determination of Hydrolysis Model

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