Partial molal volumes of polymers in aqueous solutions from partial molal volume group contributions

1980 ◽  
Vol 18 (1) ◽  
pp. 121-126 ◽  
Author(s):  
R. Zana
Keyword(s):  
Aqueous Solutions ◽  
Partial Molal Volume ◽  
Group Contributions ◽  
Molal Volume ◽  
Partial Molal Volumes ◽  
Volume Group ◽  
Molal Volumes

Partial molal volume behavior of tetraalkylammonium chlorides in aqueous acetone and aqueous dimethylsulfoxide

1970 ◽  
Vol 48 (15) ◽  
pp. 2416-2422 ◽  
Author(s):  
Digby D. Macdonald ◽  
J. B. Hyne
Keyword(s):  
Molecular Weight ◽  
Aqueous Acetone ◽  
Solvent Composition ◽  
Partial Molal Volume ◽  
Volume Data ◽  
Molal Volume ◽  
Partial Molal Volumes ◽  
Molal Volumes ◽  
Aqueous Dimethylsulfoxide ◽  
Linear Expression

The partial molal volumes of a series of tetraalkylammonium chlorides in aqueous acetone and aqueous dimethylsulfoxide at 25.000 °C are reported as a function of solvent composition. It is shown that for each solvent composition the partial molal volume data are better represented by a quadratic in solute molecular weight than by the linear expression previously employed in similar studies. Extrapolation of molecular partial molal volumes to zero cation molecular weight has permitted evaluation of the partial molal volumes of the ions R4N+ and Cl−. The variation of molecular and ionic partial molal volume as a function of solvent composition is discussed.

scholarly journals The partial molal volume of two nickel chelate complexes

1980 ◽  
Vol 58 (17) ◽  
pp. 1795-1798 ◽  
Author(s):  
Y. K. Sze ◽  
W. A. E. McBryde
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Structural Features ◽  
Partial Molal Volume ◽  
Spectral Measurements ◽  
Chelate Complexes ◽  
Molal Volume ◽  
Nickel Chelate ◽  
Partial Molal Volumes ◽  
Molal Volumes ◽  
Methyliminodiacetic Acid

Partial molal volumes have been determined for the nickel(II) complexes of ethylenediaminetetraacetic acid (mono complex) and methyliminodiacetic acid (bis complex). The formation of these is accompanied by appreciable increases in volume, greater in the case of the second ligand. The observations are discussed in terms of reduced electrostriction of water by the complexes, and the different volume increases are accounted for by structural features of the complexes which are partially confirmed by spectral measurements.

Partial molal volumes of amines in benzene. Specific interactions

1986 ◽  
Vol 64 (2) ◽  
pp. 387-393 ◽  
Author(s):  
Ester F. G. Barbosa ◽  
Isabel M. S. Lampreia
Keyword(s):  
Specific Interaction ◽  
Secondary Amines ◽  
Partial Molal Volume ◽  
Tertiary Amines ◽  
Molal Volume ◽  
Conformational Effects ◽  
Partial Molal Volumes ◽  
Amine Groups ◽  
Vibrating Tube Densimeter ◽  
Molal Volumes

Apparent molal volumes, [Formula: see text], of secondary and tertiary amines and linear hydrocarbons were determined in benzene at 25 °C, using a vibrating tube densimeter. These quantities have been extrapolated to infinite dilution to obtain partial molal volumes. The contribution to partial molal volume of the amine groups, calculated using a simple additive scheme, [Formula: see text], were interpreted in terms of conformational effects present in these molecules. A first attempt to find a measure of the contribution to the partial molal volume of the specific interaction amine–benzene in tertiary and secondary amines was made. The results agree well in the two different approaches used.

Effect of Pressure on the Solvolysis of Dimethyl-t-butyl Sulfonium Iodide in Ethanol–Water Mixtures

1972 ◽  
Vol 50 (14) ◽  
pp. 2270-2275 ◽  
Author(s):  
Claude S. Davis ◽  
J. B. Hyne
Keyword(s):  
Reaction Mechanism ◽  
Transition State ◽  
Pressure Dependence ◽  
Composition Dependence ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Effect Of Pressure ◽  
Partial Molal Volumes ◽  
Molal Volumes

The pressure dependence of the rate of solvolysis of dimethyl-t-butyl sulfonium iodide has been studied in ethanol–water mixtures at 60.00 °C. Determination of the partial molal volume of the substrate ions has enabled the volumes of activation to be dissected into initial and transition state components. The solvent composition dependence of the partial molal volumes of the two states provides further details of the nature of the reaction mechanism.

Thermodynamics of the HSO4– Formation in Aqueous Solutions up to 473 K and 975 bar

1993 ◽  
Vol 48 (11) ◽  
pp. 1073-1080
Author(s):  
B. A. Bilal ◽  
E. Müller
Keyword(s):  
Aqueous Solutions ◽  
Equilibrium Constant ◽  
Formation Constant ◽  
Saturation Pressure ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Volume Entropy

Abstract The equilibrium constant, partial molal volume, entropy and enthalpy of the formation of HSO4- ion in aqueous solutions have been determined up to 473 K and 975 bar at the ionic strengths 1 = 0 as well as in NaCl solutions having I = 1, 0.5 and 0.1 mol kg-1 At 473 K, for instance, the thermodynamic formation constant K0 decreases by ≈ 0.75 log units from saturation pressure to 975 bar. The corresponding decrease of the apparent formation constant Q at I = 1 m is ≈ 0.6 log units. The increased dissociation at higher pressure leads to a decrease of the partial molal volume and entropy due to the resulting higher electrostriction in the system.

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