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A 3.026 gram portion of Cu(II) salt was dissolved in a 250 ml volumetric flask. A 25.0mL aliquot was analyzed adding 1 g KI and titrating the liberated iodine with 23.33 mL of 0.04668 M Na2S2O3. Find the weight percent copper in the salt.© BrainMass Inc. brainmass.com October 10, 2019, 1:55 am ad1c9bdddf
find the moles of thiosulfate:
0.02333 Litre of 0.04668 mol/litre Na2S2O3.= 1.089 e-3 moles Na2S2O3
by the reaction:
1 mole I2 & 2moles S2O32- <===> 2I- + S4O62-
Solution include detailed stepwise solution to find the weight percent copper in the salt using redox titration.