6. Determine the concentration of NaCl (in grams per liter), if during potentiometric titration 20.0 ml of 0.20 N. AgNO3 solution obtained the following results:
V AgNO3, ml 15.0 20.0 22.0 24.0 24.5 24.9 25.0 25.5
E, mV 307 328 342 370 388 428 517 646

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