chem lab 9 final .docx - Experiment 9 Weak Acids and...

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Experiment 9Weak Acids and BuffersGRADING RUBRICStudent name: Skylar Byrd Lab partner name: Alexandria Hale and Devin Davis TA name: An Ho Day & time of the lab: Wednesday, 9:00 A.M. Discussion Questions(Data Analysis calculations are detailed below)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 pKadetermined?Include the three titration curves and three second derivative curves from the Part AData Analysis.
Grading Rubric – Weak Acids and BuffersGraph 2: Second derivative curve for Part A: Acetic Acid vs. NaOH Run 1Graph 3: Titration curve for Part A: Acetic Acid vs. NaOH Run 2Graph 4: Second derivative curve for Part A: Acetic Acid vs. NaOH Run 22A. M. Bohnsack Fall 2018 (revised Z. Baranová)
Grading Rubric – Weak Acids and BuffersGraph 5: Titration curve for Part A: Acetic Acid vs. NaOH Run 3Graph 6: Second derivative curve for Part A: Acetic Acid vs. NaOH Run 3PART A: Preparation and Standardization of NaOH(6 pts) Table 1: NaOH volumes at the equivalence and half-equivalence points of eachacetic acid titration, obtained from the second derivative curves.TrialNaOH volume (mL) atequivalence point NaOH volume (mL) athalf-equivalence pointpH at the half-equivalence point112.56.254.58210.915.504.101311.845.924.43Average11.755.894.373A. M. Bohnsack Fall 2018 (revised Z. Baranová)
Grading Rubric – Weak Acids and Buffers

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