A portion of the alloy weighing 0.9968 g was dissolved and, after appropriate treatment, the Cu2+ ion was titrated with EDTA by the spectrophotometric method at ʎ=62 nm. Construct a titration curve and calculate the mass fraction of copper in the alloy according to the following data:
V ml, 1.00 2.00 3.00 4.00 5.00 6.00
A 0.185 0.280 0.395 0.485 0.525 0.525 .
C(EDTA)=0.1014M. Answer: 2.84%.

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