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Experiment 7: Preparation of a Buffer

Experiment 7: Preparation of a BufferCH2250: Techniques in Laboratory Chemistry, Plymouth State UniversityCreated by Jeremiah Duncan and Wavell Fogleman, Department of Atmospheric Science and Chemistry, Plymouth State : The Preparation of Buffer solutions is a common task in the lab, especially in biological sciences. A Buffer is a solution that resists a change in pH, because it contains species in solution able to react with any added acid or base, according to the principles of equilibrium. You will study more about equilibrium and buffers in General Chemistry II; here we will limit ourselves to the practical matter of preparing a base at a desired pH.

3. Load a 50 mL buret with your Standardized NaOH solution (Experiment 6) 4. Use the pH meter to monitor the titration of the buffer until the pH changes 1 unit. Run two titrations: a quick one and a careful one. For the quick one, add NaOH in 1 mL increments. For the careful one, use your best judgment in adding titrant. 5. Repeat Steps 2-4 ...

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