Partial molal volumes and volume changes for the complex formation of metal chelate electrolytes, Na2(M(edta)) and K(M(hedta)(H2O)).
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The partial molal volumes, <I>V</I><SUP>∞</SUP>, of [M(edta)]<SUP>2−</SUP> and [M(hedta)(H<SUB>2</SUB>O)]<SUP>−</SUP> (M=Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) and H<SUB>3</SUB>hedta=<I>N</I>-(2-hydroxyethyl)ethylenediamine-<I>N</I>,<I>N</I>′,<I>N</I>′ -triacetic acid) and two free ligands, edta<SUP>4−</SUP> and hedta<SUP>3−</SUP>, have been determined from density measurements at 25 °C. From the results for <I>V</I><SUP>∞</SUP>, the volume changes for the complex formation of [M(edta)]<SUP>2−</SUP> and [M(hedta)(H<SUB>2</SUB>O)]<SUP>−</SUP>, Δ<I>V</I><SUP>∞</SUP>, were estimated. The values of Δ<I>V</I><SUP>∞</SUP>, for [M(edta)]<SUP>2−</SUP> (32.8 to 45.8 cm<SUP>3</SUP> mol<SUP>−1</SUP>) and for [M(hedta)(H<SUB>2</SUB>O)]<SUP>−</SUP> (25.2 to 36.5 cm<SUP>3</SUP> mol<SUP>−1</SUP>) were large, positive ones, and a linear relationship between Δ<I>V</I><SUP>∞</SUP> and Δ<I>S</I> was observed for these metal chelate ions.
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