3. A sample of silver alloy weighing 2.157 g was dissolved and after appropriate processing the volume of the solution was brought to 100.0 ml. Plot titration curves in coordinates E - V and dE/dV -V, and determine the mass fraction (%) of silver in the alloy, if during titration of 25.00 cm3 of the prepared solution of 0.1200 M NaCl the following was obtained:
VNaCl, cm3 16.00 18.00 19.00 19.50 19.90
E, mV 689 670 652 634 594

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