484016 Sigma-Aldrich

Potassium hydroxide

reagent grade, 90%, flakes

Synonym: Caustic potash



Related Categories Acids & Bases, Analytical Reagents, Analytical Reagents for General Use, Analytical/Chromatography, Bases,
grade   reagent grade
vapor pressure   1 mmHg ( 719 °C)
assay   90%
form   flakes
mp   361 °C(lit.)
solubility   water: soluble1120 g/L


Other Notes

A -D suffix exists for administrative purposes only.
All -D packages are 100% the same product, same quality, same specification as the package sizes previously sold without a -D.


1 kg in poly bottle

10 kg in fiber drum


Potassium hydroxide (KOH) was used in the following processes:
• Quantification of glutathione (GSH) and glutathione disulfide (GSSG) in biological samples by HPLC.
• Preparation of buffer for use in the Investigation of seed fatty acid (FA) composition, protein, oil and sugar content.
• Stable isotopic profiling study of Caenorhabditis elegans.
Potassium hydroxide may be employed as an etchant for the laser modified glass. In combination with tellurium powder, it mediates the quantitative pinacolization of aromatic carbonyl compounds.

General description

Potassium hydroxide (KOH) is a hygroscopic, water soluble base synthesized by the electrolysis of potassium chloride solution. It is the raw material for the synthesis of many potassium compounds. KOH reacts with CO2 to form potassium carbonate. This property can be utilized to absorb CO2. It participates as catalyst in aldol condensation reactions. KOH anisotropic etching of silicon is used for the fabrication of sub-micron silicon nitride waveguides using conventional contact lithography. Pulverized KOH may be used for the preparation of chalcones.

Price and Availability

Suggested Laboratory Gloves

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Safety & Documentation

Safety Information

Signal word 
Hazard statements 
UN 1813 8 / PGII
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


Aldol Condensation Reaction

The aldol condensation is an organic reaction introduced by Charles Wurtz, who first prepared the β-hydroxy aldehyde from acetaldehdye in 1872.1 In an aldol condensation, an enolate ion reacts with a...
Keywords: Addition reactions, Aldol condensation, Aldol reaction, Alkylations, Antibiotics, Asymmetric synthesis, Catalysis, Condensations, Dehydration reaction, Eliminations, Etherifications, Iodinations, Michael Addition, Rearrangements, Suzuki coupling

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