Answer
Na+ ions have greater electropositivity as compared to Ca2+ ions. Hence they can easily replace Ca2+ ion and bind themselves to the anions.
Work Step by Step
Given above
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 18 - Chemistry of the Environment - Exercises - Page 805: 18.8
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