Asked by irma
what are the reasons why the Cu(II) solution has to be titrated immediately after addition of KI?
Answers
Answered by
DrBob222
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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