16. Determine the concentration of NaCl (in g / l), if during potentiometric titration 20.0 ml of 0.20 N. Hg2(NO3)2 solution obtained the following results:
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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