Answer
A
Work Step by Step
a) $(20.8\ mL\times 6.00\ M)/1000\ mL=0.125\ M$
b) $(50.0\ mL\times 3.00\ M)/1000\ mL=0.15\ M$
Method b doesn't produce a $0.125\ M$ solution.
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.