The Kilcher Homestead is a 600 acre Pioneer Homestead that has been protected for perpetuity via a ConservatIon Easement. The Kilcher Family has also preserved the Historic Cabin and site as a LIving Museum.
Yes, negative pH is possible, but not in water as a solvent. The range of pH in water is 0 to 14 (to be more precise, it is -1.7 to 15.7, but for simplicity's sake, we start with the usual values.) Thus, what pH indicates is the ability of the acid to form H3O+, which can then donate a proton.
Acids do not have pH, they have pKa. An acid can have a negatieve pKa. A solution has a pH, and pH can be negatieve if the concentration of any strong acid is higher than 1 mole per liter. Your one example, even though strictly spoken the answer was negative: hydrochloride acid. Written Aug 25, 2015.