Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

pH

  • Kensei Kobayashi
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1176-5

Synonyms

Definition

pH describes the activity of hydronium ions (H 3O +, or more precisely the hydrated form of the proton H + in solution) in aqueous solution. pH characterizes the acidity or basicity of aqueous solutions. It is formally defined by the relation:
$$ \mathrm{p}\mathrm{H}=-{ \log}_{10}{a}_{\mathrm{H}} $$

Keywords

Aqueous Solution Acidic Solution Bioorganic Chemistry Basic Solution Concentration Index 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Yokohama National UniversityYokohamaJapan