Note that changes in dielectric constant are linearly related to the concentration of polar solute, fA, and solvent, fs, where nd and ns are the refractive indices of the solute and solvent, respectively, if the dipole moment of solvent term is approximately const'ant. If E is plotted against fA, a straight line is obtained with the slope 2n(n2 + 2 ) 2 p~2 / 9 k T . Plots of e us. fA for water in 1 ,Zdichloroethane and acetone in 1,2-dichloroethane Table I: Dielectric Constants of the System Water-l12-Dichloroethane a t 25"I n a previous communication from this laboratory,2 it was reported that acetone interacts with water to form hydrated species in l12-dichloroethane. Partition, water solubility, and nmr data were analyzed to show that the acetone monomer monohydrate is the major associated species in the acetone-water-1,Bdichloroethane system. In order to obtain additional information about the geometric structure of the acetone monomer monohydrate, the dielectric constants of solutions of acetone and water in 1,Bdichloroethane were measured. Experimental SectionDielectric constants were determined with the Kahl Dipolmeter DMOl which operates on the superposition (beat) method. An MFL2 cell (range from E = 7 to 21) with a capacity of 45 ml was used for all the measurement,s. Constant-temperature water was circulated through the water jacket of the cell; the circulated water temperature was maintained at 25.00 * 0.03'. Once a series of measurements was started, the cell was not removed or turned in its connector in order to avoid the possibility of error due to slight change in the electric contact. After the dielectric constant of each sample solution was measured, the cell was drained and rinsed with the new solution to be measured and the new solution was introduced without moving the cell. The estimated error in the dielectric constant measurements was about 0.06%. Results and DiscussionRun 1 0.0000 0.0250 0.0375 0.0555 0.0580 0.0903 0.
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