lab # 18 - Caitlyn Adams Experiment 18 Gen Chem Lab 2...

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Caitlyn Adams Experiment 18 Gen Chem Lab 2 Buffer Solutions and pH Objective: The goal of this experiment is to find pK a of acetic acid by multiple methods and to determine if an acetic acid/sodium solution acetate buffer solution is able to resist changes in pH. Hypothesis One: It is anticipated that the pK a of the acetic acid solution will be approximately 4.8. This will be determined through the use of two methods. In the first method, we will perform a titration with acetic acid and sodium hydroxide to find the concentration of acetic acid. From here, a pH meter will be used to determine the pH. The negative antilog of this value will be taken which is the concentration of hydrogen ions and will be plugged into the acid dissociation concentration formula to find k a . From here, the negative log will be taken. This value is the pK a . The second method to determine the pK a will be to make a buffer solution with the concentration of the acetate ion equal to the concentration of acetic acid so that by the Hnederson-

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