Answer
Please see the work below.
Work Step by Step
We know that
$PH=-log[H_3O]^{+}$
$PH=-log(1.5\times 10^{-3})$
$PH=2.823$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.