31 g 031 g Calculated Molarity of Acetic Acid in the sampled vinegar 093 095

31 g 031 g calculated molarity of acetic acid in the

This preview shows page 5 - 8 out of 8 pages.

0.31 g 0.31 g Calculated Molarity of Acetic Acid in the sampled vinegar 0.93 0.95 0.94 Calculated Percent Mass of Acetic Acid in sampled vinegar 5.5 % 5.8% 5.5% Average Calculated Percent Mass of Acetic Acid in Sampled Vinegar 5.65% 5.65% 5.65% Data Table 1: Titration of Vinegar with Sodium Hydroxide 5 ©2014, Carolina Biological Supply Company
Image of page 5
Determination of Acetic Acid Concentration in Vinegar Using Titration Data Table 2: Titration of Second Vinegar Sample with Sodium Hydroxide Name of Vinegar: Apple Cider Vinegar Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Mass of Vinegar 4.81 g 4.94 g 4.90 g Volume of Vinegar Density= 1.0005 g/mL 4.93 ml 4.85 ml 4.95 ml Initial NaOH volume in syringe 10 mL 10 mL 10 ml Final NaOH volume in syringe 5.4 mL 5.0 mL 5.8 mL Volume of NaOH Delivered 4.6 mL 5.0 mL 4.2 mL Moles of NaOH Delivered 0.0046 0.005 0.0042 Moles of Acetic Acid 0.0046 0.005 0.0042 Mass of Acetic Acid 0.25 g 0.31 g 0.28 g Calculated Molarity of Acetic Acid in the sampled vinegar 0.77 0.72 0.73 Calculated Percent Mass of Acetic Acid in sampled vinegar 4.26 % 4.61% 4.77% Average Calculated Percent Mass of Acetic Acid in Sampled Vinegar 4.55 % 4.55% 4.55% 6 ©2014, Carolina Biological Supply Company
Image of page 6
Determination of Acetic Acid Concentration in Vinegar Using Titration Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Initial pH Reading pH=3.211 pH=3.102 pH=3.105 Initial Buret Reading 2.89 mL 3.00 mL 1.61 mL Midpoint pH Reading pH=4.895 pH=4.687 Midpoint Buret Reading 12.92 mL 9.50 mL Final pH Reading pH=8.238 pH=8.531 pH=8.934 Final Buret Reading 20.12 mL 20.31 mL 19.00 mL Volume of NaOH consumed 17.23 ml 17.31 17.39 Calculated Molarity of Acetic Acid in the Vinegar Sample 0.87 0.87 0.87 Volume of NaOH consumed at Midpoint Reading 8.66 8.7 Moles of NaOH Consumed at Midpoint Reading [A-] 0.043 0.044 Moles of Acetic Acid Remaining at Midpoint [HA] 0.0172 0.0175 Calculated pKa 4.3 4.4 7 ©2014, Carolina Biological Supply Company
Image of page 7
Determination of Acetic Acid Concentration in Vinegar Using Titration Apple Cider Vinegar Point Vinegar Point 8 ©2014, Carolina Biological Supply Company
Image of page 8

You've reached the end of your free preview.

Want to read all 8 pages?

  • Spring '10
  • dickpowell
  • pH, Sodium hydroxide

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture