Encyclopedia of Astrobiology

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

Amphoteric Compounds

  • Kensei Kobayashi
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_5242-1



An amphoteric compound is a compound that can act both as an acid and as a base. Some metal oxides or metal hydroxides, such as aluminum oxide (Al 2O 3), show amphotericity:
$$ \mathrm{With}\ \mathrm{a}\ \mathrm{base}:\ \mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3+2\ \mathrm{Na}\mathrm{OH}+3{\mathrm{H}}_2\mathrm{O}\rightleftharpoons 2\ \mathrm{N}\mathrm{a}{\left[\mathrm{A}\mathrm{l}{\left(\mathrm{O}\mathrm{H}\right)}_4\right]}^{-} $$


Aqueous Solution Organic Compound Acidic Solution Metal Oxide Negative Charge 
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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Yokohama National UniversityYokohamaJapan