ACTIVITY 3 A Calculations of pKa from Sample Lab Data The following activity is intended as an extension activity and re

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Activity 3 A Calculations Of Pka From Sample Lab Data The Following Activity Is Intended As An Extension Activity And Re 1 (75.51 KiB) Viewed 52 times

ACTIVITY 3 A Calculations of pKa from Sample Lab Data The following activity is intended as an extension activity and requires the application of concepts from the Background and Activities 1 and 2 to Initial pH Reading Initial Buret Reading Midpoint pH Reading Midpoint Buret Reading Final pH Reading Final Buret Reading Volume of NaOH dispensed Calculated Molarity of Acetic Acid in the Vinegar Sample Volume NaOH dispensed at Midpoint Reading Data Table 3: Titration of Vinegar with Sodium Hydroxide Moles of NaOH Consumed at Midpoint Reading [A] solve a mathematical problem. The pK₂ of acetic acid is 4.75, and the volume of vinegar is 21.05 mL. Moles of Acetic Acid Remaining at Midpoint [HA] Calculated pKa 1. Review the lab data found in Data Table 3. This is from a titration of a vinegar sample using a pH meter. 2. Determine the volume of 0.1 M NaOH dispensed during the titration. Record the answer. 3. Calculate the molarity of the acetic acid in the vinegar samples. Record the answers. 4. Calculate the pka of acetic acid from the midpoint data using the Henderson- Hasselbach equations in the Background section. Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 pH = 3.211 pH = 3.102 pH = 3.105 2.89 mL 3.00 mL 1.61 mL pH = 8.238 20.12 mL continued on next page pH = 4.895 12.92 mL pH = 8.531 20.31 mL pH = 4.687 9.50 mL pH = 8.934 19.00 mL