Hydration Number and Heat of Solution in Water of Tris (ethylenediamine) complexes or Several Sulfates at Infinite Dilution

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Other Title
  • トリス(エチレンジアミン)錯体ならびに各種硫酸塩の水に対する無限希釈における水和数と溶解熱

Description

Hydration number and heat of solution in water of eight kinds of tris(ethylenediamine)complexes of nickel(II), cadmium(II) and chromium(BI), six kinds of simple salts which mainly consisted of sulfates, seven kinds of chromium (III) complexes with ligand of different valency were determined at infinite dilution (25° C) using an ultrasonic interferometer and a micro calorimeter of twin-type. Those of two kinds of cobalt (It) complexes and of two kinds of bis(ethylenediamine)copper(II) complexes were also determined. The additive property held on both bydration number and heat of solution in water of the constituent ions. The average hydration numbers per gram ion were as follows [Ni(en)3]2+: 14, [Cd(en)3]2+: 22, [Co (C08)] (NH8)41+: 24, [Cr(en), ]3+: 18, [Cu(en), ]2+: 15, OH-: 5.6 mol.<BR>But two values of hydration numbers, 7 and 16, were obtained for a sulfate ion. In the case of tris(ethylenediamine)complex ions with equal valency, those having larger ionic radius of the central metal had greater hydration number. Hydration numbers of [Cr(N1-13)O2-]+ (12) were smaller than those of NrCl2(F120)41+ (16) and NrCl(NI-13), (H20)2+ (15), and greater than that of [Cr(NCS), ]3-. Thus the change in hydration numbers of chromium (l11) complex ions by the valency consisted with the case of cobalt (III) complex ions. The heat of solution in water of these electrolytes except for several sulfates at infinite dilution (25° C) were in good agreement with the value of.6 kcal/hydrated H2O mol.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1975 (6), 963-967, 1975-06-10

    The Chemical Society of Japan

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