The most accurate values to date were determined for conductivity of water from 0-100°C, permitting new determination of high-temperature hydroxide ion equivalent conductance. These values were incorporated into a fundamental water coefficient table including hydroxide and hydrogen ion mobilities, water ionization constant, density, conductivity, and resistivity. The conductivity/resistivity values were measured with a multiple-pass, closed, recirculating flow conductivity system, with improved multiple resistance temperature device measurement, and improved analysis of temperature and impurity effects. An accurate conductivity knowledge is necessary to understand water-limiting processes and to facilitate the analysis of trace ionic impurities in water.

greatly reduced (e.g. dimethyl sulfoxide (log Kx = 1.04)27 or carbon monoxide (no reaction observed)).28 The relatively low equilibrium constants observed for good -acceptor ligands such as P(OPh)3 and CO indicate that the contribution of -back-bonding interactions to the stability of the Rh-L bond is relatively insignificant. These findings are consistent with theoretical and experimental indications of a lack of -stabilization in dirhodium(II) tetraacetate complexes.24"26 Drago and co-workers, however, have observed that the properties of dirhodium(II) butyrate14 and perfluorobutyrate15 complexes with axial -acceptor ligands cannot be interpreted on the basis of contributions alone and must include some metal-to-ligand -back-bonding interactions. The

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