[nammy]

I am almost embarrassed  to ask this question; I have concentrated HCl and I need to make one L of 0.1M HCl. Apparently my brain has gone to seed and doesn't remember how to do this simple task. I am embarrassed because I am a Chemist, but I haven't done this calculation in over 20 years, as we always have stock solutions on hand. Could someone please walk me through this? 

[macman104]

The concentrated HCL is usually 37% if I remember correctly.  I believe that is weight/weight percent.  You should also have the density available on the jug that the HCl is in.  You can calculate the molarity from there.  Hopefully that gets you on the right track.  Also check out this:

http://en.wikipedia.org/wiki/Hydrochloric_acid#Physical_Properties

[Yggdrasil]

Conc. HCl is ~12M
http://www.chem.ucla.edu/~bacher/Specialtopics/Concentrations.html

[Borek]

http://www.chembuddy.com/?left=concentration&right=dilution-mixing

http://www.chembuddy.com/?left=CASC&right=concentration-cheat-sheet

http://www.chembuddy.com/?left=CASC&right=concentration_and_solution_calculator