Identification of an Unknown Organic Acid
Identification of an Unknown Organic Acid Chem 1211K Lab
Drawer #15
Wednesday November 13th, 2013
Unknown Number: 3334025-CF13
Table of Contents Pg. #
Abstract 3 Experimental Report 4-7
Results and Discussion 7-12
Conclusion 13
**pKa Graph 14
Abstract Identifying this organic acid was an extensive task that involved several different experiments. Firstly, the melting point had to be determined. Since melting point can be determined to an almost exact degree, finding a close melting point of the specific unknown can accurately point to the identification of the acid. In this case the best melting point range was 207-209 degrees Celsius. Melting point, while very helpful in identifying an unknown organic acid, is simply not enough. Next, a series of titration experiments had to be done. In the first series, a titration is completed of sodium hydroxide (NaOH) with KHP. Three reps were completed and the resulting data led to the finding of the molarity of the sodium hydroxide. The second part of the titration series involved titrating the same prepared sodium hydroxide solution with Hydrochloric Acid (HCL). This is how the molarity of the HCL was determined. The last part to the titration series was necessary to determine the equivalent weight of the acid. The equivalent weight for this unknown was calculated to be ~197 g/mol H+ Once these titration series experiments were complete, enough data is accumulated to complete a computer search. Based on the results of the computer search the next experiment involved conducting at least one trial of pKa and, since the results contained acids that had N,Cl,Br, or S, chemical testing by sodium fusion had to completed. With all of this information combined, it was then simple to correctly identify the organic acid unknown.
Report
Experimental
A. Melting Point
To
Drawer #15
Wednesday November 13th, 2013
Unknown Number: 3334025-CF13
Table of Contents Pg. #
Abstract 3 Experimental Report 4-7
Results and Discussion 7-12
Conclusion 13
**pKa Graph 14
Abstract Identifying this organic acid was an extensive task that involved several different experiments. Firstly, the melting point had to be determined. Since melting point can be determined to an almost exact degree, finding a close melting point of the specific unknown can accurately point to the identification of the acid. In this case the best melting point range was 207-209 degrees Celsius. Melting point, while very helpful in identifying an unknown organic acid, is simply not enough. Next, a series of titration experiments had to be done. In the first series, a titration is completed of sodium hydroxide (NaOH) with KHP. Three reps were completed and the resulting data led to the finding of the molarity of the sodium hydroxide. The second part of the titration series involved titrating the same prepared sodium hydroxide solution with Hydrochloric Acid (HCL). This is how the molarity of the HCL was determined. The last part to the titration series was necessary to determine the equivalent weight of the acid. The equivalent weight for this unknown was calculated to be ~197 g/mol H+ Once these titration series experiments were complete, enough data is accumulated to complete a computer search. Based on the results of the computer search the next experiment involved conducting at least one trial of pKa and, since the results contained acids that had N,Cl,Br, or S, chemical testing by sodium fusion had to completed. With all of this information combined, it was then simple to correctly identify the organic acid unknown.
Report
Experimental
A. Melting Point
To