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What is the molar concentration

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Reference no: EM131462130

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)

Reference no: EM131462130

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