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what are the reasons why the Cu(II) solution has to be titrated immediately after addition of KI?

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irma

  1. Cu(II) reacts with I^- to produce CuI, a ppt, and liberates I2. The I2 is titrated with thiosulfate. Left on its own, the excess I^- from the KI can be oxidized by air to give more I2.

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    DrBob222

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