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Why is PbI2 precipitate yellow?
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July 25th, 2009
In the reaction:
Pb(NO3)2 + 2KI—-> 2KNO3 + PbI2
A yellow precipitate is formed, PbI2.
Why? I can see that Lead reacts with the iodine ions and the physical property changes, but what is it that causes the colour change?
Thanks in advance
p.s. I tried googling it and found a video of the experiment: http://www.youtube.com/watch?v=DITY2rXYU-I
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