Calcium—malonate complexes in aqueous solution. Thermodynamic parameters and their ionic strength dependence

Add time:08/26/2019    Source:sciencedirect.com

Formation constants of calcium complexes with malonate (mal2−), in the ranges 10 ⩽ t ⩽ 50°C and 0.05 ⩽ I ⩽ 0.9 mol dm−3, were determined by means of alkalimetric titrations in aqueous solution. The species found in this system were [Ca(mal)]0 and [Ca(Hmal)]+; also, the hydrolysis of Ca2+ was taken into account. The effect of ionic medium on the formation constants was studied by using different background salts (KNO3, NaNO3, Et4NI and Et4NBr); the parameters defining ionic strength dependence were calculated from the values of stability constants obtained at different ionic strengths. ΔH and ΔS values were obtained from temperature coefficients of stability constants.A general equation, useful for correlating the formation constants in the studied temperature and ionic strength ranges, has been found. It has also been found that, by considering all the significant interactions in the solution, the formation constants are dependent on temperature and ionic strength only.Literature data are discussed and compared with those obtained in this work.

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