Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 3 - Sections 3.1-3.12 - Exercises - Problems by Topic: 46c

Answer

Its formula is $CrPO_{4}.3H_{2}O$.

Work Step by Step

The cation of chromium(III) phosphate trihydrate has a charge of (III), i.e it is $Cr^{3+}$. The anion is phosphate, i.e $PO_{4}^{3-}$. To balance the charges, 1 $PO_{4}^{3-}$ combines with 1 $Cr^{3+}$. Then it also has 3 (tri) water molecules of hydration. So, its formula is $CrPO_{4}.3H_{2}O$.
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