Editing PH (section)

=== Unified absolute pH scale ===
In 2010, a new approach to measuring pH was proposed, called the ''unified absolute pH scale''. This approach allows for a common reference standard to be used across different solutions, regardless of their pH range. The unified absolute pH scale is based on the absolute chemical potential of the hydrogen cation, as defined by the [[Lewis acids and bases|Lewis acid–base]] theory. This scale applies to liquids, gases, and even solids.<ref name="Krossing2">{{Cite journal |last1=Himmel |first1=Daniel |last2=Goll |first2=Sascha K. |last3=Leito |first3=Ivo |last4=Krossing |first4=Ingo |date=2010-08-16 |title=A Unified pH Scale for All Phases |journal=Angewandte Chemie International Edition |volume=49 |issue=38 |pages=6885–6888 |doi=10.1002/anie.201000252 |issn=1433-7851 |pmid=20715223}}</ref> The advantages of the unified absolute pH scale include consistency, accuracy, and applicability to a wide range of sample types. It is precise and versatile because it serves as a common reference standard for pH measurements. However, implementation efforts, compatibility with existing data, complexity, and potential costs are some challenges.