Volume changes and equilibrium constants for protonation of (M(edta))2-.

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概要

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• The volume changes and the equilibrium constants for the first protonation of [Co(edta)]<SUP>2−</SUP>, [Ni(edta)]<SUP>2−</SUP>, and [Cu(edta)]<SUP>2−</SUP> (H<SUB>4</SUB>edta=ethylenediaminetetraacetic acid) have been determined from density and pH measurements at 25 °C. In the case of [Cu(edta)]<SUP>2−</SUP>, a second protonation is assumed to successively occur. The volume change and the equilibrium constant for the second protonation have been estimated. The volume changes for the first protonation of Co(II)-, Ni(II)-, and Cu(II)-edta chelates were small and positive (3.5, 3.3, and 4.8 cm<SUP>3</SUP> mol<SUP>−1</SUP>, respectively) and that for the second protonation of a Cu(II)-edta chelate was larger than the first one (8 cm<SUP>3</SUP> mol<SUP>−1</SUP>).

• 公益社団法人 日本化学会の論文

著者

• Yoshitani Kouzou

  Faculty Of Agriculture Gifu University

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