Answer
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When it dissociates, $CaCl_2$ releases 3 moles of ions per mol ($1\ Ca^{2+},\ 2\ Cl^-$), while NaCl releases only two ($1\ Na^+,\ 1\ Cl^-$).
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 13 Solutions and Their Behavior - Study Questions - Page 505e: 95
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