Help with AP Chemistry Work (due soon/urgent)

Question

I am not sure how/what to do to get to an answer here, can I get a full explanation/walk through?

HC₂H₃O₂(aq) + H₂O(l) ⇄ H₃O⁺(aq) + C₂H₃O₂⁻(aq)

The dissociation of ethanoic acid, HC₂H₃O₂(aq), is represented above. A student is given the task of determining the value of K_a for HC₂H₃O₂(aq) using two different experimental procedures.

1. The student is first asked to prepare 100.0 mL of 0.115 M HC₂H₃O₂(aq) using a 2.000 M standard solution.
2. Calculate the volume, in mL, of 2.000 M HC₂H₃O₂(aq) the student needs to prepare 100.0 mL of 0.115 M HC₂H₃O₂(aq).

Answer 1

As this is a dilution problem, you can use M1 x V1 = M2 x V2 where M1 is 2.000 M, M2 is 0.115 M, V2 is 100 mL. You have enough information to calculate V1 which is the volume in mL of 2.000 M solution needed