Me and some friends recently stumbled upon a 1M solution of Sulfuric Acid. It's in a small 30 ml bottle and has no distinct smell. After running a few amateur experiments (pouring it on stuff), we concluded that it is either extremely weak or simply water. I know from ap chemistry a few years ago that a 1M solution would contain a mole of H2SO4 per liter, or something of the sort, but I am not sure how strong this is. Is there any tests that i could do to tell if this is simply water or if someone diluted the mixture even further? Or is it extremely obvious from the explanation that it is water?