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Exceeding end point in redox reaction Watch

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    Hi everyone
    I'm doing a redox titration with potassium bi-ethanedioatecopper(II)-2-water

    I am first titrating it (when added to sulfuric acid) with potassium manganate until it reaches "just pink"
    Then adding KI and titrating with sodium thiosulfate until I add starch and it no longer turns blue black

    Question - if in the first titration, the "just pink" is exceeded, this may cause the titre value of the 2nd titration to be too large. Suggest a reason for this

    Thank you!
 
 
 
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