An analytical chemist obtains a sample of a novel organic acid and is asked to confirm its
Question:
An analytical chemist obtains a sample of a novel organic acid and is asked to confirm its molecular weight. The mass spectrometer in the lab is out of order, so they opt to perform a back titration.
a. Given the information recorded during the determination, calculate the molar mass of the acid assuming that the solid is a pure monoprotic acid. (no error propagation required).
Mass of acid dispensed = 1.3789 g Concentration of std. NaOH = 0.1003 M Volume of std. NaOH added = 50.00 mL Concentration of std. HCl = 0.1001 M
Initial burette reading = 0.37 mL
Reading at methyl red endpoint = 23.76 mL
The value obtained surprises the synthetic chemists, who claim it is about double the expected value. What might the analytical chemist reasonably conclude from this new information, and how might they go about testing this? (3 marks)
Statistics For The Behavioral Sciences
ISBN: 9781111830991
9th Edition
Authors: Frederick J Gravetter, Larry B. Wallnau