hydroxide ion

anion
ChemicalSubstance type_of_chemical_entity Q199877
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hydroxide ion

Summary

hydroxide ion is a type of chemical entity[1]. It ranks in the top 6% of type_of_chemical_entity entities by monthly Wikipedia readership (19 views/month).[2]

Key Facts

  • hydroxide ion's instance of is recorded as type of chemical entity[3].
  • hydroxide ion's chemical structure is recorded as Hydroxide lone pairs-2D.svg[4].
  • hydroxide ion's CAS Registry Number is recorded as 14280-30-9[5].
  • hydroxide ion's canonical SMILES is recorded as [OH-][6].
  • hydroxide ion's InChI is recorded as InChI=1S/H2O/h1H2/p-1[7].
  • hydroxide ion's InChIKey is recorded as XLYOFNOQVPJJNP-UHFFFAOYSA-M[8].
  • hydroxide ion's chemical formula is recorded as HO⁻[9].
  • hydroxide ion's subclass of is recorded as polyatomic anion[10].
  • hydroxide ion's subclass of is recorded as monoanion[11].
  • hydroxide ion's subclass of is recorded as monoprotic acid[12].
  • hydroxide ion's part of is recorded as hydroxide salt[13].
  • hydroxide ion's Commons category is recorded as Hydroxide ion[14].
  • hydroxide ion's has part is recorded as oxygen[15].
  • hydroxide ion's has part is recorded as hydrogen[16].
  • hydroxide ion's PDB structure ID is recorded as 4YGK[17].
  • hydroxide ion's PDB structure ID is recorded as 2BUX[18].
  • hydroxide ion's PDB structure ID is recorded as 2BUT[19].
  • hydroxide ion's PDB structure ID is recorded as 2BUM[20].
  • hydroxide ion's PDB structure ID is recorded as 5FQA[21].
  • hydroxide ion's PDB structure ID is recorded as 3Q1G[22].
  • hydroxide ion's PDB structure ID is recorded as 4D4Z[23].
  • hydroxide ion's PDB structure ID is recorded as 3DTU[24].
  • hydroxide ion's PDB structure ID is recorded as 1CPX[25].
  • hydroxide ion's PDB structure ID is recorded as 4HAL[26].
  • hydroxide ion's PDB structure ID is recorded as 1JKU[27].

Body

Works and Contributions

Things named for hydroxide ion include feroxyhyte[28], a mineral species[29] and behoite[30], a mineral species[31].

Why It Matters

hydroxide ion ranks in the top 6% of type_of_chemical_entity entities by monthly Wikipedia readership (19 views/month).[2] It has Wikipedia articles in 11 language editions, a strong signal of global cultural recognition.[32] It is known by 45 alternative names across languages and contexts.[33]

Entities named for it include feroxyhyte[28], a mineral species[29] and behoite[30], a mineral species[31].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] . wikidata.org.
  2. [4] . wikidata.org.
  3. [5] . Global Substance Registration System. Retrieved . commonchemistry.cas.org. Provenance: wikidata.org.
  4. [6] . PubChem. Retrieved . wikidata.org.
  5. [7] . PubChem. Retrieved . wikidata.org.
  6. [8] . PubChem. Retrieved . wikidata.org.
  7. [9] . PubChem. Retrieved . wikidata.org.
  8. [10] . wikidata.org.
  9. [11] . wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.
  14. [16] . wikidata.org.
  15. [17] . Protein Data Bank. Retrieved . wikidata.org.
  16. [18] . Protein Data Bank. Retrieved . wikidata.org.
  17. [19] . Protein Data Bank. Retrieved . wikidata.org.
  18. [20] . Protein Data Bank. Retrieved . wikidata.org.
  19. [21] . Protein Data Bank. Retrieved . wikidata.org.
  20. [22] . Protein Data Bank. Retrieved . wikidata.org.
  21. [23] . Protein Data Bank. Retrieved . wikidata.org.
  22. [24] . Protein Data Bank. Retrieved . wikidata.org.
  23. [25] . Protein Data Bank. Retrieved . wikidata.org.
  24. [26] . Protein Data Bank. Retrieved . wikidata.org.
  25. [27] . Protein Data Bank. Retrieved . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [28] . wikidata.org. → on this site
  2. [30] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [29] . Wikidata. wikidata.org. → on this site
  2. [31] . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [32] . Wikidata sitelinks. wikidata.org.
  3. [33] . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). hydroxide ion. Retrieved May 3, 2026, from https://4ort.xyz/entity/hydroxide-ion
MLA “hydroxide ion.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/hydroxide-ion.
BibTeX @misc{4ortxyz_hydroxide-ion_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{hydroxide ion}}, year = {2026}, url = {https://4ort.xyz/entity/hydroxide-ion}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): hydroxide ion — https://4ort.xyz/entity/hydroxide-ion (retrieved 2026-05-03)

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