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.
What is pH. We speak about a low pH when the soil contains a high level of hydrogen-ions(H+). The more of these ions ,the more acidic the soil is, and the lower is the pH. With less of these ions, the pH of the soil is higher. The pH-scale goes from 0 to 14, where pure water has a pH of 7, we call this neutral. So lower than 7 is acidic and higher is base, or alkaline. Soil with a pH of 4.5 is 100 times more acidic than a soil with a pH of 6.5. Soil with a pH of 4.5 will lack a lot of elements needed for healthy growth.