Answered: Property Water n-Pentane Molecular…

Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter5: Gases, Liquids, And Solids

Section: Chapter Questions

Problem 5.65P

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Suppose a chloride ion and a sodium ion are separated by a center–center distance of 5 Å. Is the interaction energy (the energy required to pull them infinitely far apart) predicted to be larger if the medium between them is water, or if it is n-pentane? If Ca ²⁺, Na⁺, and F ^- each have ionic radii ∙1.16. Which ionic bond is stronger: Ca-F or Na-F? If Ca ²⁺ is often bound on the surface of a protein by carboxylic acid functional groups. If the pK_a of a particular ¬COOH group is 4.2, would you predict Ca ²⁺ to be most tightly bound at pH 8, pH 4.2, or pH 3? Explain your answer.

Property
Water
n-Pentane
Molecular weight (g/mol)
18.02
72.15
Density (g/cm)
0.997
0.626
Boiling point (°C)
100
36.1
Dielectric constant
78.3
1.84
Viscosity (g/cm · s)
0.890 x 10-2
0.228 x 10-2
Surface tension (dyne/cm)
71.97
17

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