Why acetic acid is added in estimation of copper?
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Explanation:
Iodometric determination of copper is based on the oxidation of iodides to iodine by copper(II) ions, which get reduced to Cu+.
The initial reaction, not the titration, is given as:
2Cu2++4I−⟶2CuI(s)+I2
Then the titration reaction is:
2S2O32−+I2⟶S4O62−+2I−
Sodium thiosulphate makes for an inexpensive, safe and effective reducing agent to react with I2.
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