16. A portion of the adjusting substance weighing m g was dissolved in a volumetric flask with a capacity of 50.00 ml and the solution was brought to the mark with glacial acetic acid. Potentiometric titration of 5.00 ml of the resulting solution with perchloric acid in anhydrous acetic acid gave the following results:
Option 3 (sodium carbonate Na2CO3, m= 0.2500 g)
V(HClO4), ml 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00 5.20
E, mV 431 439 450 465 486 523 550 566 575
Construct curves of potentiometric titration in the coordinates E-V and ΔE/ΔV and calculate the molar concentration of the equivalent of a solution of perchloric acid no: 1) potassium hydrophthalate; 2) diphenylguanidine; 3) soda.

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