common

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    Common topics on DAT?

    Hi I'm studying for my DAT right now, and was curious of any topics that practically guaranteed to show up on the QR, Ochem, Gen chem, and bio sections? Stuff that that shows up often and is known? Any help would be appreciated!
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    Common Ion Solubility

    I am getting confused on this concept. Everywhere says that Common Ions decrease solubility. Yet in this problem, Ksp of PbCl2 is 1.6x10-5. What is the solubility of PbCl2 in .01 M KCl? The solubility is .16 M. So wouldn't that mean that common ions make the solubility increase?