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.
The lower the pH, the higher the concentration of H+ ions and the more acidic the solution is. pH is basically a measure of how many H+ ions are in solution. We calculate pH through this formula: [math]pH=-log[H+] [/math] So you are basically taking the negative log of the concentration of H+ molecules in solution. So, for example, if we have 10 mols of H+ ions per liter of solvent, our pH would be -1.