Conclusion The objective of this lab was to use a solution with a known concentration to establish the concentration of NaOH, and the molar mass of unknown acid # 25. The purpose of this lab was in fact achieved. In this experiment, the concentration of NaOH in part A was obtained, and the unknown acid was solved for by titrating the unknown solution with a solution of known concentration. In part A, the concentration of oxalic acid was 0.10356mol/L. When titrating a solution with known concentration (oxalic acid) with NaOH, it was discovered that NaOH had an average concentration of 0.1038 mol/L. There were three titrations completed. ( Titration #1 - 0.1050 mol/L, #2 - 0.1024 mol/L, #3 - 0.1040 mol/l .) In part B, an unknown acid was titrated with NaOH which has a known concentration. It is concluded that unknown acid #25 is diprotic, and has an average molar mass of 127.6 g/mol. Three titrations where completed. ( Titration #1 - 130.8 g/mol, #2 - 123.9 g/mol, #3 - 127.6 g/mol). Referring to the chart of possible unknown acids in the Fall 2013 Chem. Lab Manual on page 29, the unknown acid is oxalic acid which has a molar mass of 126.07 g/mol. Therefore the molar mass obtained, 127.6 g/mol is an acceptable value. Furthermore, correct measurement tools were identified and information about how to titrate accurately was given. The reliability of experimental methods is up to par, and can lead other experimenters wishing to complete this lab to attain accurate results. Although for even more accurate results, titrations should be done with 5-10 trials.
Conclusion The objective of this lab was to use a solution with a known concentration to establish the concentration of NaOH, and the molar mass of unknown acid # 25. The purpose of this lab was in fact achieved. In this experiment, the concentration of NaOH in part A was obtained, and the unknown acid was solved for by titrating the unknown solution with a solution of known concentration. In part A, the concentration of oxalic acid was 0.10356mol/L. When titrating a solution with known concentration (oxalic acid) with NaOH, it was discovered that NaOH had an average concentration of 0.1038 mol/L. There were three titrations completed. ( Titration #1 - 0.1050 mol/L, #2 - 0.1024 mol/L, #3 - 0.1040 mol/l .) In part B, an unknown acid was titrated with NaOH which has a known concentration. It is concluded that unknown acid #25 is diprotic, and has an average molar mass of 127.6 g/mol. Three titrations where completed. ( Titration #1 - 130.8 g/mol, #2 - 123.9 g/mol, #3 - 127.6 g/mol). Referring to the chart of possible unknown acids in the Fall 2013 Chem. Lab Manual on page 29, the unknown acid is oxalic acid which has a molar mass of 126.07 g/mol. Therefore the molar mass obtained, 127.6 g/mol is an acceptable value. Furthermore, correct measurement tools were identified and information about how to titrate accurately was given. The reliability of experimental methods is up to par, and can lead other experimenters wishing to complete this lab to attain accurate results. Although for even more accurate results, titrations should be done with 5-10 trials.