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Characterization of an Unknown Acid

Characterization of an Unknown Acid - Chem 1M...

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Chem 1M Characterization of an Unknown Acid Abstract: An unknown acid was identified through close recordings in the change in pH as NaOH was added to the acid. And the melting point was determined by putting the unknown acid under high temperature. The melting point of our unknown acid was 140˚C. By watching the change in pH through titration with a strong base to the acid we were able to calculate the concentration of the acid which came out to be 2.6x10^-3 and the molar mass of the acid which was 115.5g/mol. The unknown acid came to be identified as Ortho-Nitrobenzoic. Results: M NaOH .09756M Mass of Unknown Acid .3002g n acid 2.6x10^-3 MM acid 115.5g/mol pKa 2.6 T melting 140˚C Identified Acid Ortho-Nitrobenzoic Discussion: As we went through this lab step by step we were able to determine the molar mass of the unknown acid which was 115.5g/mol. We used this to help us find the pKa which also equals the pH of the acid which came out to 2.6. To find these results we titrated the unknown acid by slowly adding 1ml of NaOH which is a strong base.
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