Potassium hydroxide
Potassium hydroxide is indexed in ChEBI under CHEBI:32035, with the reported formula HO.K. Use the source record and structural identifiers below to confirm the material you need. — ChEBI
Safety documents & references
2 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 1310-58-3 | ChEBI ↗ |
| Molecular formula | HO.K | ChEBI ↗ |
| Molar mass | 56.105 g/mol | ChEBI ↗ |
| Monoisotopic mass | 55.96645 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:32035 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 56.106 g/mol | PubChem ↗ |
| Exact mass | 55.96644614 Da | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifierpotassium hydroxidepotassium hydroxideKWYUFKZDYYNOTN-UHFFFAOYSA-M[K+].[OH-]InChI=1S/K.H2O/h;1H2/q+1;/p-1Classification & relationships
ChEBI ontologySafety classification · Japan
NITE / Japanese governmentPotassium hydroxide · H29-B-117
| Endpoint | Reported classification |
|---|---|
| Acute toxicity （Oral） | Category 3 |
| Skin corrosion/irritation | Category 1 |
| Serious eye damage/eye irritation | Category 1 |
| Specific target organ toxicity - Single exposure | Category 1 (respiratory organs) |
| Specific target organ toxicity - Repeated exposure | Category 1 (respiratory organs) |
| Aspiration hazard | Category 1 |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 56.105 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsKOHCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsExplore literature using this exact identifier.
Sources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.