Include appropriate captions. Figure 1: Figure1:Titration Curve of Acetic Acid and NaOH in Trial 1 Figure 2: Figure 2:Second Derivative Curve in Trial 1 3 MendezFall 2018 (revised Z. Baranová)

Grading Rubric – Weak Acids and Buffers Figure 3: Figure 3:Titration Curve of Acetic Acids and NaOH in Trial 2 Figure 4: Figure 4:Second Derivative Curve of Trial 2 Figure 5: 4 MendezFall 2018 (revised Z. Baranová)

Grading Rubric – Weak Acids and Buffers Figure 5:Titration Curve of Acetic Acid and NaOH in Trial 3 Figure 6: Figure 6:Second Derivative Curve of Trial 3 Figure 7: 5 MendezFall 2018 (revised Z. Baranová)

Grading Rubric – Weak Acids and Buffers Figure 7:Buffered Titration Curve of Acetic Acid and NaOH Figure 8: Figure 8:Second Derivative Curve of Buffered Acetic and NaOH Figure 9: 6 MendezFall 2018 (revised Z. Baranová)

Grading Rubric – Weak Acids and Buffers Figure 9:Buffered Titration Curve of Acetic Acid HCl Figure 10: Figure 10:Second Derivative Curve of Buffered Acetic Acid and HCl Discussion Questions(Data Analysis calculations are detailed below) 7 MendezFall 2018 (revised Z. Baranová)

Grading Rubric – Weak Acids and Buffers 1.(4 pts)Using the average pH at the half-equivalence point from the acetic acid titrations (Table 1), determine the pKaof the acetic acid solution. How was the pKa determined? Include the three titration curves and three second derivative curves from thePart A Data Analysis.

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PART A: Preparation and Standardization of NaOH (6 pts) Table 1: NaOH volumes at the equivalence and half-equivalence points of each acetic acid titration, obtained from the second derivative curves. Trial NaOH volume (mL) atequivalence pointNaOH volume (mL) athalf-equivalence pointpHathalf- equivalence point 19.620 4.8104.82 29.618 4.8094.85 39.746 4.8734.87 Average9.661 4.8314.85 2.(4 pts)Calculate theKa of your acetic acid solution. Discuss this calculation. Based on the value ofKa, is acetic acid a strong acid or a weak acid? Why?