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Iodine thiosulphate titration with copper

Why cant you do titration directly to find amount of coppee ions. Why do you have to add the iodide and find amount of iodine etc.???
Original post by Razorr4
Why cant you do titration directly to find amount of coppee ions. Why do you have to add the iodide and find amount of iodine etc.???


It's because of the difficulty in finding something to titrate copper with that is specific to copper. The usual titrant for transition metal ion titrations is EDTA, but this will also react with any other transition metal ions present (e.g. an impurity of nickel or iron) giving a false titration value.

The oxidation of iodide ions by Cu2+ is more specific to copper. Hence adding excess iodide, and titrating the iodine formed is usually a more accurate way of determining Cu2+ concentration.

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