1N#5 - 5-24-06Chem 1NLab #13Characterization of an Unknown...

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Unformatted text preview: 5-24-06Chem 1NLab #13Characterization of an Unknown AcidAbstract: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=3.08Trail #1Trial #2 NaOH (mL)pHNaOH (mL)pH3.083.0813.2513.323.4133.6333.5853.8943.774.0453.8194.1863.9114.3274124.3784.08134.449.44.22144.5104.28154.57114.34164.64124.41174.72134.47184.79144.54194.88154.62204.98164.69215.09174.75225.22184.83235.42194.95245.74205.0424.56.01215.16256.62225.3525.29.05235.6225.39.63245.825.410.0710....
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This note was uploaded on 04/15/2008 for the course CHEM 1N taught by Professor Roland during the Spring '06 term at University of California, Santa Cruz.

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1N#5 - 5-24-06Chem 1NLab #13Characterization of an Unknown...

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