The apparent molal volumes of 1:1 electrolytes in urea solution. II. Variation of apparent molal volume with salt concentration

The apparent molal volumes of sec-butanol and t-butanol in water and in aqueous micellar system of sodium dodecyl sulphate have been determined from density measurements at different surfactant concentrations and temperatures. The partial molal volumes of the alcohols in aqueous micellar system at infinite dilution, V20 (mean, mic) were obtained from apparent molal volume data and compared with the corresponding values in aqueous solvent, V20 (mean, aq). The standard partial molal expansibilities, E20 (mean) of the alcohols were evaluated from V20 (mean) data at various temperatures. The transfer apparent molal volumes, ∆φtr0 for the alcohols from water to surfactant-water system are determined from apparent molal volume data. The sign and magnitude of these parameters are used to analyze the location of the solubilizate (alcohols) in the micellar system and the nature of interactions between alcohols and the micellar aggregates.

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Thermodynamic properties of aqueous organic solutes in relation to their structure. Part III. Apparent molal volumes and heat capacities of low molecular weight alcohols and polyols at 25 °C

Canadian Journal of Chemistry ◽

10.1139/v76-089 ◽

1976 ◽

Vol 54 (4) ◽

pp. 624-631 ◽

Cited By ~ 140

Author(s):

Carmel Jolicoeur ◽

Ghyslain Lacroix

Keyword(s):

Butyl Alcohol ◽

Heat Capacities ◽

Apparent Molal Volume ◽

Molal Volume ◽

Specific Effects ◽

Alkyl Groups ◽

Tert Butyl Alcohol ◽

Dilute Aqueous Solutions ◽

Solute Interactions ◽

Molal Volumes

The density and specific heat of dilute aqueous solutions of various alcohols and polyols have been measured at 25 °C. Such measurements have been carried out for the following solutes: methanol, ethanol, n-propanol, n-butanol, isobutanol, s-butanol, tert-butyl alcohol, n-pentanol. 3-pentanol, neo-pentanol, ethyleneglycol, 1,4-butanediol, 1,6-hexanediol, dimethyl-2,2-propanediol, 1,1,1-tris(hydroxymethyl)ethane, and pentaerythritol.The limiting apparent molal volume [Formula: see text] and heat capacities [Formula: see text] derived from these data exhibit some variations among the properties of isomers (e.g. branched vs. normal alkyl groups), but these variations cannot be conclusively attributed to specific effects in the hydration of the alkyl groups. On the other hand, the data allows one to derive group contributions to [Formula: see text] and [Formula: see text] namely [Formula: see text] for the methylene group, [Formula: see text] for the OH functional group and [Formula: see text] for the C—H of a terminal methyl group.The concentration dependence of [Formula: see text] brings out some interesting new features. With most of the alcohols, [Formula: see text] decreases with concentration, in a way related to the degree of hydrophobicity of the alcohol. Solute–solute interactions contribute to reduce [Formula: see text] of the hydrophilic solutes, but the opposite effect is observed with the most hydrophobic alcohols.

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Apparent molal volumes of aqueous solutions of bis-tetraalkylammonium salts at 25�C: Methylene-group contribution to the limiting molal volume

Journal of Solution Chemistry ◽

10.1007/bf00655372 ◽

1977 ◽

Vol 6 (9) ◽

pp. 581-587 ◽

Cited By ~ 2

Author(s):

Patrick Carpenter ◽

Siegfried Lindenbaum

Keyword(s):

Aqueous Solutions ◽

Group Contribution ◽

Tetraalkylammonium Salts ◽

Molal Volume ◽

Apparent Molal Volumes ◽

Molal Volumes ◽

Methylene Group

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Partial molal volumes of calcium-montmorillonite

Clay Minerals ◽

10.1180/claymin.1971.009.2.03 ◽

1971 ◽

Vol 9 (2) ◽

pp. 177-184 ◽

Cited By ~ 4

Author(s):

E. A. Ferreiro ◽

A. K. Helmy

Keyword(s):

Silica Gel ◽

Alcohol Concentration ◽

Apparent Molal Volume ◽

Surface Charges ◽

Molal Volume ◽

Density Measurements ◽

Partial Molal Volumes ◽

Molal Volumes ◽

Low Alcohol

AbstractPartial molal voltmae of Ca-montmorillonite, apparent molal volume of silica gel in water and of Ca-montmorillonite in ethanol-water mixtures, were determined using pycnometer density measurements. No electrostriction of water was observed with silica gel but took place in Ca-montmorillonite thus indicating the principle role of surface charges in stricting water. In ethanol-water mixtures alcohol molecules were salted out at low alcohol concentration, but they started reaching inner zones near the clay surfaces when their mole fraction in solution was increased beyond the value of 0·55.

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