Answer
$10^{-5}$ moles
Work Step by Step
If $p_{H}=-\log H^{+}$, then
$\log H^{+}=-p_{H}$
$H^{+}=10^{-p_{H}}$
So, for $p_{H}=5.0,$
$H^{+}=10^{-5.0}=0.00001=10^{-5}$ moles
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