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1N#5 - Chem 1N Lab#13 Characterization of an Unknown Acid...

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5-24-06 Chem 1N Lab #13 Characterization of an Unknown Acid Abstract: In this experiment, the identity of an unknown acid was determined from a list of possible acids. This was determined by measuring the pKa value, the molar mass, and the melting point of the acid. In Part I two titration curves were found and then drawn to find pKa value and the molar mass. In Part II, the melting point of the acid was found using a meltemp device. The unknown acid was determined to be benzoic acid, since results showed that the molar mass was 123.36 g/mol, the pKa value was 4.35, and the melting point was 117 degrees Celsius. Data/Results/Sample Calculations : Part I: Unknown Acid #: 163A Mass of Acid= 0.3005 g pH Initial=3.08 Trail #1 Trial #2 NaOH (mL) pH NaOH (mL) pH 0 3.08 0 3.08 1 3.25 1 3.3 2 3.41 3 3.63 3 3.58 5 3.89 4 3.7 7 4.04 5 3.81 9 4.18 6 3.9 11 4.32 7 4 12 4.37 8 4.08 13 4.44 9.4 4.22 14 4.5 10 4.28 15 4.57 11 4.34 16 4.64 12 4.41 17 4.72 13 4.47 18 4.79 14 4.54 19 4.88 15 4.62 20 4.98 16 4.69 21 5.09 17 4.75 22 5.22
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18 4.83 23 5.42 19 4.95 24 5.74 20 5.04 24.5 6.01 21 5.16 25 6.62 22 5.35 25.2 9.05 23 5.62 25.3 9.63 24 5.8 25.4 10.07 24.5 6.16 25.5 10.46 25 9.4 26 10.82 25.5 9.85 26.5 11.02 25.6 10.06 27 11.13 25.7 10.24 25.8 10.31 25.9 10.48 26 10.56 26.1 10.64 26.5 10.84 27 11.02 27.5 11.15 Avg Veq= (25.2+25)/2= 25.1 mL Avg ½ Veq= (12.6+12.5)/2= 12.55 mL
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