A portion of a copper (II) salt sample weighing 0.9968 g was dissolved and, after appropriate treatment, Cu2+ ions were titrated with a 0.1044 M solution of complexone III (EDTA) by the spectrophotometric method at λ=620 nm. Plot the titration curve and calculate the mass fraction (%) of copper in the sample from the following data:
V (EDTA), ml 1.0 2.0 3.0 4.0 5.0 6.0 7.0
A 0.185 0.28 0.385 0.485 0.525 0.525 0.525

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