hydroxide ion

[/haɪˈdrɒksaɪd ˈaɪən/]
nounpl: hydroxide ions
íon hidróxido
1. A negatively charged ion (anion) consisting of an oxygen atom bonded to a hydrogen atom, with the chemical formula OH⁻; commonly found in basic or alkaline solutions
Water dissociates into hydrogen ions and hydroxide ions in solution.
A água se dissocia em íons hidrogênio e íons hidróxido em solução.
2. The conjugate base of water; formed when a base is dissolved in water or when water undergoes autoionization
The hydroxide ion concentration determines the pH of a basic solution.
A concentração de íons hidróxido determina o pH de uma solução básica.
This is technical scientific terminology used uniformly across English-speaking countries and Brazil in chemistry education and research. There are no colloquial or regional variations. The term is essential in understanding acid-base chemistry, water chemistry, and pH calculations in both American and Brazilian educational contexts.
Synonyms / Sinônimos
OH⁻hydroxyl ionalkali ion
Antonyms / Antônimos
hydronium ionhydrogen ion

Regional Variations

General Brazilian Portuguese
íon hidróxido
Standard scientific terminology used in chemistry courses and research
Portugal
ião hidróxido
European Portuguese spelling uses 'ião' instead of 'íon'
Academic/Scientific
íon OH⁻
Chemical formula often used interchangeably with the full name in technical contexts

Related Words

hydroxidebasealkalipHalkaline solutionhydronium ionionizationdissociation
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