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 Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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