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Answer is:  minimum concentration of chlorine anion is 0.0216 M.
Balanced chemical reaction: Pb²⁺(aq) + 2Cl⁻(aq) → PbCl₂(s).
[Pb²⁺] = 0.025 M.
Ksp = 1.17·10⁻⁵.
Ksp = [Pb²⁺] · [Cl⁻]².
[Cl⁻] = √Ksp ÷ [Pb²⁺].
[Cl⁻] = √0.0000117 ÷ 0.025.
[Cl⁻] = 2.16·10⁻² M.