4. Determine the concentration of NH4Cl (in grams per milliliter) in the solution, if the following results were obtained during potentiometric titration of 20.0 ml of this solution with a 0.05 N solution of Hg(NO3)2:
V Hg(NO3)2, ml 10.0 18.0 17.0 17.5 17.9 18.0 18.1 18.5 19.0
E, mV 382 411 442 457 498 613 679 700 711

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