Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
The generic structural formula for a 1-alkyl-3-methylimidazolium
cation is where R is a ¬CH21CH22nCH3 alkyl group. The melting
points of the salts that form between the 1-alkyl-
3-methylimidazolium cation and the PF6
- anion are
as follows: R = CH2CH3 1m.p. = 60 °C2, R = CH2CH2CH3
1m.p. = 40 °C2, R = CH2CH2CH2CH3 1m.p. = 10 °C2, and
R = CH2CH2CH2CH2CH2CH3 1m.p. = -61 °C2. Why does
the melting point decrease as the length of alkyl group
increases?

Transcribed Image Text:+
H
H3C
'N´
-R
=C
H
H.
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