Answer
Please see the work below.
Work Step by Step
We know that the rate law for the reaction of iodide ion arsenic acid and hydrogen ion is given as
$Rate=K[I^{-}][H_3AsO_4][H^{+}]$ and thus the overall order is $1+1+1=3$ that is third order.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 13 - Rates of Reaction - Questions and Problems - Page 577: 13.6
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