Actually, I was looking for the answer to this question. So far I know that household vinegar has a pH of 2.3. It stings cuts, but does not do real damage. For cleaning minerals from an irrigation line, I need a pH of 2.0 using sulfuric acid, and it sometimes gets down to 1.7. I wear rubber gloves, but have sometimes spilled some on my skin with no noticeable ill effect. I'm looking for a more authoritative answer.
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