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A Volumetric Study of Aqueous Primary Alcohols as Functions of Concentration and Temperature

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Abstract

Density measurements of aqueous solutions of ethanol, 1-butanol, and 1-pentanol made in this laboratory along with those made for methanol, ethanol, and 1-propanol by Benson and Kiyohara form the basis for a volumetric analysis of solutes possessing both hydrophilic and hydrophobic regions as functions of both concentration and temperature. The extent of deviation of the modified volume function with mole ratio was shown to provide a quantitative measure of non-ideality. The deviations from ideality for dilute solutions are mediated by the solvated regions surrounding the hydrophobic region and are a function of the number of methylene groups. This region was shown to consist of water exhibiting a higher degree of hydrogen bonding than that of bulk water in accordance with previous studies. Moreover, the partial molar volume at infinite dilution for these primary alcohols is nearly a linear function of the number of methylene groups.

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Acknowledgments

Several of the undergraduates were supported by summer research grants: W. M. Keck Foundation Research Fellowship (AH), Rose Hills Foundation Science Research Fellowship (RB and EK), Eaton Ecological Research Fellowship (RS), and CMC Dean of the Faculty Summer Research Fellowship (AY). The undergraduate students were assisted in sample preparation and data acquisition by a cadre of extremely capable high school student volunteers. They are Peter Xi Chen (Los Osos HS, Rancho Cucamonga, CA), Elissa Cheung (Walnut HS, Walnut, CA), Erica Ho (Diamond Bar HS, Diamond Bar, CA), Christine Hu (Walnut HS, Walnut, CA), and Charleen Tan (Upland HS, Upland, CA).

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Authors and Affiliations

  1. Keck Science Department, Claremont McKenna, Pitzer, and Scripps Colleges, 925 N. Mills Ave., Claremont, CA, 91711, USA

    Anthony F. Fucaloro, R. Burgess, P. Chary, A. Hu, E. Kan, Y. Lakliang, R. Stewart & A. Yoshino

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  1. Anthony F. Fucaloro
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  2. R. Burgess
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  3. P. Chary
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  4. A. Hu
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  5. E. Kan
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  6. Y. Lakliang
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  7. R. Stewart
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  8. A. Yoshino
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Correspondence to Anthony F. Fucaloro.

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Fucaloro, A.F., Burgess, R., Chary, P. et al. A Volumetric Study of Aqueous Primary Alcohols as Functions of Concentration and Temperature. J Solution Chem 44, 2236–2257 (2015). https://doi.org/10.1007/s10953-015-0400-7

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  • DOI: https://doi.org/10.1007/s10953-015-0400-7

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