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The molarity of the stock solution was 2.00 M NaOH. So you'd set up the equation as (2 M)(Vi)=(.650 M)(.250 L). Vi=.08125 L which is equivalent to 81.2 mL (only 3 sig figs are given, and numbers ending with 5 are rounded to the closest even number).
Yes the units for molarity are in liters, however I believe if the question is asking for the final volume in milliliters and you are given milliliters you can keep the number in milliliters so you do not have to convert the answer at the end!
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