Nature of Acids & Bases Data Sheet & Post-Lab...

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EXPERIMENT 1 DATA SHEET Table 2: Sodium Acetate Data Sodium Acetate (g) Molarity of Sodium Acetate (M) 4 g 0.49 M Table 3: Buffer Solutions and pH Readings Buffer Volume of Acetic Acid (mL) Volume of Sodium Acetate (mL) pH A 5 5 6.4 B 5 1 15.3 C 10 1 5.7 D 1 10 5.5 E 1 5 15.2 ©eScience Labs, LLC 2015
POST-LAB QUESTIONS 1. Show your calculations for the molarity of sodium acetate (recorded in Table 2). Acetic acid molarity = 45 / 60 g/mol x 1 L =0.75 m Sodium Acetate molarity= 4 g / 82.03 g/mol x 0.1 L = 0.49 m 2. Using the Henderson-Hasselbalch equation, calculate the predicted pH value for each buffer solution based on the volumes given in Table 3. The pKa of acetic acid is 4.75. Show your work. a. Buffer A: pH= 4.75 + log (5/5) = 4.75 b. Buffer B: pH= 4.75 + log (5/1) = 5.49 c. Buffer C: pH= 4.75 + log (10/1) = 5.75 ©eScience Labs, LLC 2015
d. Buffer D: pH= 4.75 + log (1/10) = 3.75 e. Buffer E: pH= 4.75 + log (1/5) = 4.05 3. Calculate your pH percent error for each buffer solution based on your theoretical calculations in Question 2 and your measured values in Table 3. Show your work.

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