3. A 0.2500 g sample of sodium carbonate Na2CO3 was dissolved in a 50.00 ml volumetric flask and the solution was made up to the mark with glacial acetic acid. The following results were obtained from potentiometric titration of 5.00 ml of the resulting solution with perchloric acid in anhydrous acetic acid:
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
Plot potentiometric titration curves in E-V and ΔE-ΔV coordinates and calculate the molar concentration of the perchloric acid solution equivalent to sodium carbonate.

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