Exceeding end point in redox reaction

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DrSum98
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#1
Report Thread starter 6 years ago
#1
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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