Answer
1.7 M
Work Step by Step
Using the equation for molarity:
$M_{i}V_{i}= M_{f}V_{f}$
$\implies M_{i}=\frac{M_{f}V_{f}}{V_{i}}=\frac{0.085\,M\times500.0 \,mL}{25.0\,mL}$
$= 1.7\,M$
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.