I think the number is 37%. I worked in a lab for several years. We used the concentrated version to make dilute versions for titrations, usually 0.01-0.1 molar. The concentration out of the bottle was 12 molar. The opened bottle gives off fumes, but was not a problem when making the dilute versions if being careful. The hardware version is much less, could be half as Rusty says, I don't know.
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