Answer
Calcium and Magnesium ions are mainly responsible for hardness of water. They are mostly found in the form of carbonates, chlorides and sulfates dissolved in water.
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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 807: 18.50a
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