Chemistry: The Central Science (13th Edition)

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

Chapter 16 - Acid-Base Equilibria - Exercises - Page 716: 16.11a

Answer

$PCl_{4}^+$ is the Lewis acid and $Cl^-$ is the Lewis base.
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Work Step by Step

A Lewis acid is a chemical species with an empty orbital capable of accepting electrons from a Lewis base, and a Lewis base is a chemical species with a free electron pair (not bonding with any other atom). Therefore, $PCl_{4}^+$ is a Lewis acid and it reacts with $Cl^-$ (Lewis base) to form a Lewis adduct. The free electron pair has been highlighted in red.
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