Lab7 - Uyen Nguyen Buffers April 1, 2008 Chem 002, Section...

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Uyen Nguyen Buffers April 1, 2008 Chem 002, Section 005
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Introduction: This laboratory experiment dealt with buffers, which are used to limit the change in pH that occurs when acid or base is added or when a solution is diluted. This experiment was very important because it allowed students to understand the importance of a buffer capacity and how it works. Our goal was to find out how much HCl is required to change the pH of the buffer by one unit. Experimental Procedure: Materials used: 0.200 M acetic acid 0.200 M sodium acetate Distilled water Graduated 10 mL pipette 125 mL Erlenmeyer flask Buret 0.15 M HCl solution 0.15 M NaOH solution Procedures: 1. Try to estimate the volume of 0.200 M acetic acid, 0.200 M sodium acetate, and distilled water required to make a 20 mL buffer solution with a pH of 4. 2. Use a graduated 10 mL pipette to measure these volumes into a 125 mL Erlenmeyer flask. Make two identical buffers. Measure the pH of each buffer and record it. 3. Set up a buret filled with 0.15 M HCl. Record the initial volume of the buret, then slowly add HCl from the buret to the buffer solution until you can change the pH from 4 to 3. 4.
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Lab7 - Uyen Nguyen Buffers April 1, 2008 Chem 002, Section...

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