7. Determine the concentration of sodium chloride in the solution (g/l), if the following results were obtained during potentiometric titration of 20.0 ml of a 0.2000N Hg2(NO3)2 solution:
V, Hg2(NO3)2, mL 10.0 18.0 19.0 19.5 19.9 20.0 20.1 20.5
E, mV 501 552 570 589 629 704 737 757

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