Answer
See answer below.
Work Step by Step
Since $pH=-log[H_3O^+]$
$[H_3O^+]=10^{-10.5}=3.16\times10^{-11}\ M$
Basic, since $pH\gt7$.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 4 Stoichiometry: Quantitative Information about Chemical Reactions - Study Questions - Page 179e: 56
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