33. A sample weighing 0.0250 g containing a mixture of amines and indifferent impurities was dissolved in anhydrous acetic acid and titrated with an acetic acid solution of 0.0800 M HClO4.
Construct a titration curve and calculate the mass fraction (%) of amines in the mixture: 1) p-bromoaniline and m-nitroaniline.

Option Optical density of solution after adding titrant HClO4
0.4 ml 0.6 ml 0.8 ml 1.0 ml 1.2 ml 1.4 ml 1.6 ml 1.8 ml 2.0 ml 2.2 ml 2.4 ml
1 0.680 0.680 0.680 0.680 0.550 0.410 0.280 0.150 0.04 0.04 0.04
Answer: 55.05; 43.10%.

If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.