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Sagot :
The process of finding out how much of a particular substance is in a liquid by measuring how much of another substance is needed to react with it is known as titration.
Titration with sodium tiosulfate Na2S2O3, in the presence of an excessive amount of KI solution, can be used to measure the amount of copper in a sample.
The two half-reactions occuring are:
Cu2+(aq) + I- (aq) + e- → CuI (s)
2S2O3^ 2- (aq) → S4o6^ 2- (aq) + 2e-
A half-reaction is the part of an overall reaction that represents, separately, either an oxidation or a reduction. Two half-reactions, one oxidation and one reduction, are necessary to completely describe a redox reaction.
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