AAMC 3 PS #4; the order the ions show up

[onedirection]

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Can someone explain this question to me

It's the one where the series of chemical tests are being done

Why is CO2 precipitating out before I2 at the addition of Pb2+?

I dont see the logic to the AAMC answer

 

[Patassa]

here, http://forums.studentdoctor.net/showthread.php?t=385665

middle of the page, post #27