For complexometric titration, how is the concentration of the ligand calculated when given the concentration of EDTA and alpha value?

University of Ilorin CHM107 2020 past question

1. [Y⁴⁻] = α × [EDTA]
2. [Y⁴⁻] = [EDTA] / α
3. [Y⁴⁻] = α + [EDTA]
4. [Y⁴⁻] = α - [EDTA]

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