1. Determine the concentration of ammonium chloride in the solution (g / l), if the following results were obtained during potentiometric titration of 20.0 ml of a solution of 0.0500 N mercury nitrate:
V, Hg2(NO3)2, ml 10.0 15.0 17.0 17.5 17.9 18.0 18.1 18.5 19.0
E, mB 382 411 442 457 498 613 679 700 709
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