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 Home > Journal of Chemical Education > Issues > 1997 > March >
March 1997 Featured on the Cover
issue cover
March 1997
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A striking and beautiful demonstration of Le Chatelier's principle is discribed by Cortel in Equilibrium with Fried Eggs of PbI2 and KPbI3. If a crystal of KI is placed on a Petri dish and a drop of Pb(NO3)2 solution is added, crystals of both PbI2and KPbI3 can form, making a "fried egg" with yellow PbI2 in the center and white KPbI3 around the outside. The relative sizes of the "white" and "yolk" can be varied by using larger or smaller crystals of KI with the same volume of Pb(NO3)2 solution. As an exercise, you should predict whether the yolk or white gets bigger as the size of the KI crystal increases. (The answer is shown graphically within the article.)



The cover was designed by Betsy True.
  Home > Journal of Chemical Education > Issues > 1997 > March > Featured on the Cover


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