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" ... Some acids are stronger than others, and in 1909, Sørensen proposed that we could quanitify how acidic or alkaline a substance was by measuring its concentration of hydrogen ions. He coined the term pH, which is scientific shorthand for the concentration of positively-charged hydrogen ions in a solution, because "pH" is much less unwieldy to say and write. But pH may be a little confusing at first glance, because acids have a high concentration of hydrogen ions, so we say they have a low pH. Bases have a high concentration of hydrogen ions, so they have a high pH. ... "