Chemistry Question about Buffers!

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This is for biochemistry, but this is stuff we should have learned in general chemistry (which I took 5 years ago). So even if you're in general chemistry you might be able to help me with this. I didn't find anything about glycine buffers in our book. All of the problems I have in this homework are basically the same, so I'm only going to post one because if someone could just explain the one problem to me, I should be able to figure out the rest. I'm just not having any luck since at the moment I have no explanation at all. "What weight of glycine (pK1 = 2.4, pK2 = 9.6) and what volume of 0.5 N HCl would be necessary to make 100 mL of 0.2 M buffer of pH 2.4?" I checked for typos and this is correct. The 0.5 HCl is in N, not M. I really don't remember much from general chemistry, so if anyone could help me with this problem I would greatly appreciate it! Thanks in advance!