Difference between revisions of "Hydroxide Ion (Chemistry)"
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| − | A '''Hydroxide ion''' ('''OH<sup>-</sup>'''), is a [[Negative Ion| | + | A '''Hydroxide ion''' ('''OH<sup>-</sup>'''), is a [[Negative Ion|negative ion]] of [[Hydrogen]] [[bond]]ed to [[Oxygen]] found in [[acid]] [[solution]]s. |
===About Hydroxide Ions=== | ===About Hydroxide Ions=== | ||
Revision as of 17:42, 7 April 2019
Key Stage 4
Meaning
A Hydroxide ion (OH-), is a negative ion of Hydrogen bonded to Oxygen found in acid solutions.
About Hydroxide Ions
- When a basic compound dissolves in water it forms Hydroxide ions.
- Hydroxide ions are responsible for the corrosive properties of alkalis.
Examples
Metal Hydroxides form Hydroxide ions in water.
- NaOH(aq) → Na+(aq)+OH-(aq)
- KOH(aq) → K+(aq)+OH-(aq)
- Mg(OH)2(aq) → Mg+2(aq)+2OH-(aq)
- Ca(OH)2(aq) → Ca+2(aq)+2OH-(aq)
- Al(OH)3(aq) → Al+3(aq)+3OH-(aq)
Metal Oxides react with water to produce Metal Hydroxides which also form Hydroxide ions.
- Na2O(s) + H2O(l) → 2Na+(aq)+2OH-(aq)
- K2O(s) + H2O(l) → 2K+(aq)+2OH-(aq)
- MgO(s) + 2H2O(l) → Mg+2(aq)+2OH-(aq)
- CaO(s) + 2H2O(l) → Ca+2(aq)+2OH-(aq)
- Al2O3(s) + 3H2O(l) → 2Al+3(aq)+6OH-(aq)
Ammonia also reacts with water to produce Hydroxide ions:
- NH3O(aq) + H2O(l) ⇌ NH4+(aq)+OH-(aq)