Chemistry: The Science in Context (4th Edition)

Published by W.W. Norton & Co.
ISBN 10: 0393124177
ISBN 13: 978-0-39312-417-0

Chapter 2 - Atoms, Molecules, and Ions: Matter Starts Here - Problems - Page 71: 90



Work Step by Step

Calcium forms the ion Ca$_{2+}$. The nitrate ion is given by the formula NO$_{3}^{-}$. Calcium has a +2 charge whereas nitrate has a -1 charge. For the compound between calcium and nitrate to have a neutral charge, the charges must equal. We need two negative charges to counter the +2 charge of calcium. To do this, we need to combine two nitrate ions for every calcium atom. The molecular formula for calcium nitrate is option (d) Ca(NO$_{3}$)$_{2}$.
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