Lab Report Exp8

Lab Report Exp8 - Ryan Cohen 1/14/09 Acid-Base Equilibria...

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Ryan Cohen 1/14/09 Acid-Base Equilibria The purpose of this lab is to explore the dynamics of acid-base equilibria and how they are applied to create buffered solutions. Part 1 of the lab sought to uncover certain properties of acids in buffer solutions, such as the dissociation constant (Ka), through the graphical analysis of a titration curve. Part 2 of the lab sought to mathematically calculate the Ka value of an acid and compare the corresponding pH to a measured amount. Finally, part 3 of the lab demonstrated the capacity of buffers to endure pH change by comparing the pH of a buffered and unbuffered solution when strong acid and strong base was added to each. Part 1 of the lab sought to determine a dissociation constant, Ka, for Acetic Acid, by interpreting a titration curve when NaOH was added to Acetic Acid. Essentially, a strong acid, NaOH, was titrated at about 1ml intervals with Acetic Acid while the pH was recorded in each interval and graphed. Using the Henderson-Hasselbach equation, it can be deduced that ph = pKa when the ratio of Acetic Acid to Acetate is 1. Essentially, this ratio is achieved at ½ the equivalence point. Using this information, the pKa mirrored the pH at ½ the observed equivalence point and could be used to determine the Ka for Acetic Acid. The equivalence point was noticed as the point where a sharp increase in pH occurred. The volume determined at the
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This note was uploaded on 05/17/2011 for the course CHEM 1AL taught by Professor Hooker during the Spring '07 term at UCSB.

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Lab Report Exp8 - Ryan Cohen 1/14/09 Acid-Base Equilibria...

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