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Chem 2 Weak base strong acid Lab Report

Chem 2 Weak base strong acid Lab Report - CHEM 113 Weak...

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CHEM 113 Weak Base and Strong Acid
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PURPOSE The purpose of this experiment is to determine the equilibrium constants and concentration for acetic acid and aqueous ammonia with the use of titration curves. A titration of a Weak- Acid-Strong Base and Strong Acid- Weak Base will be done with a graph that is created for each of the titrations. With the titration graphs, the equivalence points can be read that will tell you the volume of base needed. Then with the volume data, the concentration of acid can be found. Then we use the half equivalence point to find out the pKa value since the pH is equal to pKa. Therefore when we have the pKa we can use that value to determine the Ka of the acid. PROCEDURES The first step involves preparing the acetic acid. 10 mL of concentrated acetic acid is placed in a 50 mL beaker. Then add 20 mL of distilled water to a 100-mL volumetric flask with a graduated cylinder and 5.00 mL of the acetic acid solution into a volumetric flask. Swirl the flask to mix it and then fill the flask to the mark with distilled water and mix it again. The titration of Acetic acid with NaOH will be done. 10 mL of distilled water is added to 250 mL Erlenmeyer flask using a graduated cylinder and then pipette 20.00 mL of your diluted acetic acid solution. Next, set up a titration making sure that .10 M NaOH is in the buret. A
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