Lab Report2

Lab Report2 - Lab Report Characterization of an Unknown...

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Lab Report Characterization of an Unknown Acid Abstract In this experiment, we tried to find the identity of an unknown acid using titration and knowledge of how a buffer works. For the experiment, we used a solution of the acid, alcohol and distilled water, in which we titrated small amounts of NaOH in to, to view the changes in pH. We watched for the point where the buffer region ended at the equivalence point, and the pH went up dramatically for each mL of base we added. Our results helped us determine where the solution was neutralized by the base, and give us indications of what kind of weak acid we were using. Data Volume of NaOh vs pH 0 2 4 6 8 10 12 0 5 10 15 20 25 30 35 Volume NaOh (mL) Series1 pKa = 3.99 ½ Equivalence Point = 12.4 mL of NaOH pH at 12.4 mL= 3.99 pKa= pH at .5 equivalence point pH = pKa + log(1/1) pKa = 3.99 n(acid)= .0024 mols/L Molarity = .09706 M Equivalence Point = 24.8 mL = .048 L
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M=mols/L .09706=mols/.048L mols = .0024 mols/L of acid MM(acid)= 122.02 grams mass of acid = .29284 grams
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Lab Report2 - Lab Report Characterization of an Unknown...

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