7. The hitch of the installation substance of the sodium carbonate weighing 0.2792 g was dissolved in a measuring flask with a capacity of 50.0 ml and the solution was brought to a label of ice acetic acid. Calculate the molar concentration of the equivalent of chloric acid if, with a potentiometric titration of 5.00 ml of the resulting solution, chlorine acid in anhydrous acetic acid received the following results:
V, (ml) 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00 5.20 5.4
E, MV 431 439 450 465 486 523 550 566 575 576

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