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i want to know why maximum (w/w) percent concentration of commercial acids is same to their molar mass, for example for HCl the maxmim concentration is 37 and it's molar mass is 36.5 and maximum concentration of H2SO4 is 98%(w/w) and it's molar mass is 98. thanks alot!

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marked as duplicate by Loong, bon, Todd Minehardt, Jan, M.A.R. Oct 24 '15 at 21:45

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    $\begingroup$ I think this is just a coincidence. As you may have already noticed, the molar mass is not exactly the same as the maximum concentration. $\endgroup$ – bon Oct 24 '15 at 10:19
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It's a coincidence as HBr is 48% (MW ~81), phosphoric acid is 85% (~98), hydrofluoric acid 97% (MW ~20).Look here for more http://www.csudh.edu/oliver/chemdata/acid-str.htm

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  • $\begingroup$ Bon. We must have posted at the same time. Apologies $\endgroup$ – Beerhunter Oct 24 '15 at 10:28

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