If your titration solution is 0.420 M in NaOH, and the endpoint occurs at 13.70 mL of titrant, how many mmol of NaOH are required to reach the endpoint? How many mmol of acetic acid (HC2H3O2) are required to react with the NaOH? How many grams of acetic acid is this? If the mass of analyte is 10.20 grams, what is the mass % of acetic acid in the analyte?