18. In standard solutions of Cd2 salt with concentration C(Cd2), the electrode potentials of the cadmium-selective electrode relative to the silver-silver chloride electrode were measured (the ionic strength of the solutions is constant). The data for constructing the calibration graph are given in Table 1.
Option 2
С(Cd2), mol/l 1.0*10-1 1.0*10-2 1.0*10-3 1.0*10-4 1.0*10-5
E, mV 100 46.0 -7.00 -60.0 -116.0
The Cd2 solution under study with a volume of V1 was placed in a volumetric flask and the volume was brought to V2. Then we measured the electrode potential of the cadmium-selective electrode (Ech) in the resulting solution. Construct a graph in coordinates Е-рС(Сd2), where рС(Сd2)=-log[C(Cd2), mol/l
V1, ml V2, ml Ex m, V Determine
20 50 -40.0 С(Сd2), mol/l

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