12. Potentiometric titration of 20.00 ml of sodium chloride solution with 0.2000 M silver nitrate solution yielded the following results:
V(AgNO3), ml 15.0 20.0 22.0 24.0 24.5 24.9 25.0 25.1 25.5
E, mV 307 328 342 370 388 488 517 606 646
Construct integral and differential titration curves and calculate the mass of sodium chloride in the analyzed solution. Suggest an indicator electrode and a reference electrode for this titration, characterize their structure and properties.

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