141. Задачка по химии №014 101

18. A weighed portion of proline weighing 0.0480 g (M = 115.13 g / mol) of pure grade was dissolved in glacial acetic acid and titrated with 0.1 M (K = 1.035) HClO4 in anhydrous CH3COOH. The potentiometric titration results are shown below:
V (НСlO4), ml 3 00 3.20 3.40 3.60 3.80 4.00 4.20 4.40
E, mB 136 145 157 176 279 325 339 345
Plot titration curves and calculate the mass fraction (%) of the main substance in the sample.

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