Chemistry: The Central Science (13th Edition)

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

Chapter 4 - Reactions in Aqueous Solution - Exercises - Page 159: 4.50b

Answer

+3

Work Step by Step

NaAlH4. Na is an alkali metal so it is +1. This means that AlH4 is an ion with a charge of -1 so it is AlH4-. Hydrogen is bonded to a metal so it is -1 and we have 4 of them so that is -4. Since AlH4 has a charge of -1 then we have: oxidation state Al -4 = 0 or oxidation state Al = +3
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