Determination of Acetic Acid Concentration in Vinegar Using Titration Discussion Questions 1.Given the following experimental data, calculate the molarity of the acid analyte (HA) in the titration, if the balanced neutralization reaction is H3A + 3 NaOH à Na3A + 3 H2O.The endpoint was achieved when 31.25 mL of 0.413 M NaOH had been added to 25.0 mL of the analyte. Show your work. You may do this either by typing using the equation editor in Word, or by working the problem on paper, taking a photo,and pasting the photo into the space below. Data Tables Data Table 1: Titration of Vinegar with Sodium Hydroxide Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Mass of Vinegar 5.50 4.91 5.01 Volume of Vinegar Density = 1.005 g/mL 5.47 4.88 4.99

4 ©2014, Carolina Biological Supply Company Determination of Acetic Acid Concentration in Vinegar Using Titration Initial NaOH volume in syringe 9.9 10.0 10.0 Final NaOH volume in syringe 5.2 5.6 5.1 Volume of NaOH Delivered 4.7 4.4 4.9 Moles of NaOH Delivered 0.106 0.111 0.123 Moles of Acetic Acid in Sample 0.95 1.14 1.01 Mass of Acetic Acid in Sample 57.05 66.06 60.65 Calculated Molarity of