34. Solution to Chemistry Problem

24. An aliquot of a solution containing a mixture of chloride and iodide ions was titrated potentiometrically with a solution of AgNO3 with a silver electrode. For this, the test solution was brought to the mark with water in a 50 ml measuring flask and 10.0 ml of the resulting solution was transferred to the titration cell. The following results were obtained:
Option I: C(AgNO3)=0.01954 M

V(AgNO3), ml 0.6 0.66 0.73 0.76 0.80 0.85 0.90 0.95 100
E, mV -180 -155 -125 -75 25 175 200 220 240
V(AgNO3), ml 1.05 1.10 1.15 1.20 1.30 1.35 1.40 1.45
E, mV 255 265 305 330 360 375 380 385

Option II: C(AgNO3)=0.01970 M
V(AgNO3), ml 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
E, mV -106 -100 -95 -86 -72 -30 21 30 50
V(AgNO3), ml 0.90 1.0 1.10 1.20 1.30 1.40 1.45 1.50 1.60 1.70
E, mV 80 130 156 176 200 275 315 332 348 355