5. For the amperometric determination of Cd2 ions in beer 500 cm3, it was evaporated to 10 cm3 and titrated with a K4[Fe(CN)6] solution with a molar equivalent concentration of 0.0100 mol/dm3. In this case, the following instrument readings were obtained:
V(K2Cr2O7), cm3 0.5 1.0 1.5 2.0 2.5 3.0 4.0
IDiff, µA 83 44 5 4 4 4 4
Construct a titration curve and calculate the content of Cd2 ions in 1dm3 of beer.

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