Answer
$1.58 \times 10^{-6}$
Work Step by Step
We are given the model: $pH =- \log [H^{+}]$
Therefore, $5.8=- \log [H^{+}]$
Or, $-5.8= \log [H^{+}]$
or, $10^{-5.8}=[H^{+}]$
Therefore, $[H^{+}]=1.58 \times 10^{-6}$
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