Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 23 - Transition Metals and Coordination Chemistry - Exercises - Page 1034: 23.35b

Answer

$ [Co(NH_{3})_{4}CO_{3}]_{2} SO_{4}$

Work Step by Step

The formula is written according to the rules of writing the formula for complex compounds. 1. Tetraamminecarbonatocobalt(III) is a cation whereas sulfate is the anion. Cations are written first then anion. 2. Tetraamminecarbonato is the ligand and cobalt (III) is the metal. Thus, $[Co(NH_{3})_{4}CO_{3}]$ 3. Cobalt (III) means the oxidation number of cobalt is +3. $NH_{3}$ is a molecule, it has no charge. Carbonate has a -2 charge. Thus, the charge on the complex is $+3-2 = +1$ 4. The charge on Sulfate is -2. In order to balance the charges on the cation and anion, two atoms of the complex should be present. Therefore, the formula of the complex should be: $ [Co(NH_{3})_{4}CO_{3}]_{2} SO_{4}$
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