130 Determine the concentration of NaCl in the solution, g/l, if the following results were obtained during potentiometric titration of 20 ml of a solution with a 0.2000 M solution of AgNO3:
V (AgNO3), ml 15.0 20.0 22.0 24.0 24.5 24.9 25.0 25.1 25.5
E, mV 307 328 342 370 388 428 517 606 646

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