The catenation and isomerisation effects on stability constants of complexes formed by some diprotic acids.
Stability constants (K(ijk)) of complexes Na(i)K(j)H(k)L(+i+j+k-2) (0<i+j+k</=2) formed by dicarboxylic (oxalic, malonic, succinic, glutaric, adipic and methylmalonic, dimethylmalonic, ethylmalonic) acids in solutions of mixed salts (NaNO(3), KNO(3)) of ionic strength I=1.64 mol l(-1) are presented. The unbiased values for K(ijk), (K(ijk))(% e=0), were obtained from the linear relationships logK(ijk)=a+b(% e) stated on the basis of the results of repeated titrations made in titrand+titrant systems of high ionic strength, % e is the relative error of determination of the weak acid (H(2)L) concentration. These data were then applied to indicate the catenation or the isomerisation effects on the K(ijk) values.
Janecki
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Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Poland.
Styszko-Grochowiak
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K
Michałowski
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T