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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Today's Featured Article - The Day Tractor Lovers Dream About - by Angus Crawford. The day started at five o'clock on the morning of Friday, the January 29, 1999. My father, my sister, my uncle, my cousin and myself all climbed into my uncle's Toyota van. It was six thirty in the morning and we had a long day ahead. We traveled for six and a half hours to our destination - a little country town with a population of no more then one hundred and fifty people (57 of them being children under the age of thirteen). We arrived hoping to meet up with a man we knew had over one
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