While technically we started this unit a week ago, I'm betting most of us didn't look at the notes, do practice problems, or anything resembling normal unit work. Today though, we learned about molarity. It was a nice lesson to start the unit off on given that it wasn't too hard. Regardless of the fact that I thought I had gotten the hang of it, I did the book work. While I did it, i found an interesting little method that really worked for me. Whenever I wasn't quite sure how to start off a problem, I wrote down the molarity expressed in mol/L. For some reason (I think it's that it makes it look just like a regular dimensional analysis problem), this gets my brain in gear so that I can see in my head how the rest of the problem is supposed to run. This got me the right answer every time because all that it does is flip the order of multiplication which we all know doesn't affect the product.
For more practice, I used www.chemteam.info which has 35 questions on molarity with full solutions. To better understand the concepts, you can also use phet.colorado.edu which is a good way to learn if you're more of a tactile learner. It also covers other subjects like saturation (and it's actually a little fun to mess around with).
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