Explain the i3- ion was then titrated with thiosulfate

Reference no: EM13496578

A 2.50 g sample of a bronze gong was cut out and dissolved in suklfuric acid. The copper sulfate produced was mixed with KI to form CuI and the triiodide ion, I3-. The I3- ion was then titrated with thiosulfate, S2O3 2-.

Cu+ 2 H2SO4 -> Cu SO4 + SO2 + 2 H2O
2CuSO4 + 5 I- -> 2 CuI + I3- + 2SO4 2-
I3- + 2S2O3 2- -> 3I- + S4O6 2-

If it took 31.5 mL of 1.00 M thiosulfate for this titration, how many mols of copper were present in the original 2.50 g sample?

Reference no: EM13496578

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