"38% hydrochloric acid" (~12.4M) as you buy it, is a pretty rough estimate. And it needs a fume cupboard and goggles etc to handle, so once a year or so I make a few litres of roughly 4M, then I can use that to make the 2M, 1M, 0.1M etc that we use daily.
As long as know the actual "4M" concentration (e.g. 4.17M) I can do accurate dilutions, so I check with a titration when I make it.
Did my annual batch today. 4.00M
Sheer fluke.
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