Posted by maggie on Tuesday, October 16, 2012 at 5:21pm.
I don't think your question is worded properly. I think you have 12 M HCl and want to prepare 500 mL of 0.4M.
c1v1 = c2v2
12*mL = 0.4*500
Solve for mL of the 12 M material. Place that in the 500 mL volumetric flask and make to the mark. Shake thoroughly.
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