28-1. A weighed portion of an alloy of mass m g was dis

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28-1. A weighed portion of an alloy of mass m g was dissolved and, after appropriate treatment, the Cu2 + ions were titrated with the EDTA spectrophotometric method at λeff. = 620 nm. Build the titration curve and calculate the mass fraction (%) of copper in the alloy according to the following data:
m = 0.5112 Concat complexone mol / l 0.09842
Opt. solution density after adding EDTA, ml:
1 2 3 4 5 6
0.16 0.25 0.35 0.44 0.45 0.45

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