(Answered) 100 ml of a cu2nbspsolution of unknown concentration was

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10.0 mL of a Cu²⁺ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H₂O to a total volume of 75 mL. The solution was titrated with 0.25 M Na₂S₂O₃. The equivalence point of the titration was reached when 11.65 mL of Na₂S₂O₃ had been added. What is the molar concentration of Cu²⁺ in the unknown solution?

Assistance:

2Cu²⁺ + 4KI → 2CuI + I₂ + 4K⁺ (rxn 1)

I₂ + 2Na₂S₂O₃ → 2NaI + Na₂S₄O₆ (rxn 2)

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