Experiment 19.pdf - Experiment 19 Exploring Buffers and...

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Experiment 19 Exploring Buffers and Buffer Capacity Kate Genty Riley Galloway February 28, 2017 CHEM 1212K Section A22 TA: ArielleNabatilan Honor Pledge – Freshman Chemistry LaboratoriesI did not copy any portion of this work from the work of other students, old lab reports, or unreferenced materials. I understand that such activity is a violation of the Georgia Tech Honor Code. ______________________________________ Signature
Abstract1
Data & Results a.Data Tables and Plots Part A: Sodium Acetate/Acetic Acid Buffer Procedure and Results 1. Base Capacity of Acidic Buffer In order to test the capacity of the acidic buffer, the amount of sodium acetate trihydrate required to create the buffer was first calculated using the Henderson-Hassalbalch equation. Then the calculated amount of sodium acetate trihydrate, 1.546 g, was combined with 100 mL of 0.1 M acetic acid. 20 mL of this solution was placed in a smaller beaker so that the measurements would be more accurate. Then the initial pH of the solution, 4.70, was measured using a calibrated pH probe. Next, 2 mL total of a strong base, specifically 0.5 M NaOH was added to the acetic acid/sodium acetate buffer in 0.5 mL increments in order to make sure that the buffer capacity was not exceeded. After each time the 0.5 mL of 0.5 M NaOH was added, the new pH was measured using a pH probe. After the first time 0.5 mL was added, the pH of the solution was 4.80. The next time 0.5 mL of 0.5 M NaOH was added, the pH of the solution was 4.92; the third time 0.5 mL of 0.5 M NaOH was added, the pH of the solution was 5.02; when all 2 mL of the NaOH was added, the pH of the solution was 5.13. Procedure and Results 2. Base Capacity of Water, a Control 20 mL of deionized water was also placed in a smaller beaker and used in this part of the experiment. The pH of the water was initially measured to be 6.57 using a calibrated pH probe.

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