How do I get a pH of 2 with 37% HCl?

I am following a guide on seed germination of a rare wild species. Others who have worked with the seeds suggest soaking at pH 2 (adjusting with HCl). I have a stock solution of 37% HCl and I want to make 250 ml of solution total. How much distilled water and how much HCl should I add to get a pH of 2?




Putting together all the helpful comments into a single answer! Thanks to @Maurice we know that 2 pH = 0.01 mol/L). We can use that in @Ivan Neretin comment who says to divide 1 L of HCl by 12 (the molarity of 37% HCl), then divide that again by 100. This concurs with the comment by @Mithoron who suggests diluting the HCl 1200 times.


So, to get 250 mL of solution with a pH of 2 using 37% HCl, I would divide 250 by 1200 = 0.21 mL HCl.


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