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M- pH Buffers and Titration

M- pH Buffers and Titration - Melody Samuel-Boutros PHS...

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Melody Samuel-Boutros PHS 2301- 8:00- 10:50 AM Title: pH Buffers and Titration Objective: The purpose of this experiment is to make us examine the different buffers and mark their buffer range. Methods: Refer to lab handout, page 5 Results : See graphs attached Discussion and References: A buffer is an equilibrium mixture of conjugate weak acid/base pair designed to resist change in pH. A good buffer will withstand change in pH. Water did not do this during the experiment. In the first 0.5mL addition of acid, the pH value went from 7.85 to 3.49. Phosphate was a much better buffer, it took a much longer time to change the pH than the carbonate. It had a greater “buffer range.” Buffer range is the range in pH where it is most effective. Questions: 1. Which flask needed the least acid to effect a change? Water needed the least acid to effect change. 2. Which flask needed the most acid to effect a change? Phosphate needed the most acid to effect change.
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