Experiment 18- Buffers.docx - Experiment 18 Buffer...

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Experiment 18: Buffer SolutionsObjective:We want to find the pKaof acetic acid by using multiple methods. Secondly, we want to determine if an acetic acid/sodium acetate buffer solution is able to resist changes in pH.Hypothesis:A buffer is a solution that resists changes in pH upon the addition of a small amount of strong acid or strong base. With that being said, an acetic acid/ sodium acetate buffer solution will be a good one because it maintains an even, acidic pH in the presence of small amounts of base or acid. What happens is, as the acid is used up, by alkaline or basic substances, more of the acetic acid hydrolyses and releases a hydrogen ion, which increases the acidity, to compensate. The reverse happens when an acid is added: the acetic acid does not hydrolyze so much and the hydrogen ions return to the acetate ion to re-form acetic acid as a purely covalent compound (non-acidic), so increasing the pH.

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