The partial molar volumes of a number of monovalent salts and polar species were measured In a series of organic solvents. The solvents Included ethanol, methanol, Af-methylformamlde (NMF), propylene carbonate, sulfolane, acetonitrile, acetone, and 4-methyl-2-pentanone. The polar species were n -propyl bromide, n-propyl iodide, and n-propyl chloride. The monovalent salts that were examined Included LIBr, Lll, LIN03, Nal, KI, Rbl, CsBr, tetrabutylammonlum Iodide, tetrabutylammonlum bromide, and tetrabutylammonlum perchlorate. The major observation was that the solvent effect on the partial molar volumes was most pronounced for monovalent salts. The solvent effect on the partial molar volume of the neutral solute was very small. The largest solvent effects are seen for the small monovalent salts when comparing aprotlc and protlc solvents. The conclusion was that the nonlonlc solutes do not grossly change the structure of the solvent, but the Ionic solutes change the structure of the solvent significantly.

mation of micelles and their subsequent growth as a function of surfactant concentration in an aqueous medium.

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The conductance of LII, LiBr, and Nal In acetonitrile and of tetra-n-butylammonlum Iodide and tetra-n-butylammonlum bromide In acetone and In 4-methyl-2-pentanone were measured as a function of pressure. Data are reported at 25 °C over a concentration range of 0.0001-0.03 M and at pressures up to 2-3 kbar. Analysis of these data using Justice's modification of the Fuoss-Onsager equation yields values of the limiting conductance and the association constants as a function of pressure. Both the limiting conductance values and the association constants decrease with Increasing pressure, and from the latter values of the volume change on association are calculated.