221473

Sigma-Aldrich

Potassium hydroxide

ACS reagent, ≥85%, pellets

Synonym(s):
Caustic potash
Linear Formula:
KOH
CAS Number:
Molecular Weight:
56.11
EC Number:
MDL number:
eCl@ss:
38100303
PubChem Substance ID:
NACRES:
NA.21

Quality Level

grade

ACS reagent

vapor pressure

1 mmHg ( 719 °C)

assay

≥85%

form

pellets

impurities

≤0.001% N compounds
≤2.0% K2CO3
10-15% water

pH

~13.5 (25 °C, 5.6 g/L)

mp

361 °C (lit.)

anion traces

chloride (Cl-): ≤0.01%
phosphate (PO43-): ≤5 ppm
sulfate (SO42-): ≤0.003%

cation traces

Ca: ≤0.005%
Fe: ≤0.001%
Mg: ≤0.002%
Na: ≤0.05%
Ni: ≤0.001%
heavy metals: ≤0.001% (by ICP-OES)

SMILES string

[OH-].[K+]

InChI

1S/K.H2O/h;1H2/q+1;/p-1

InChI key

KWYUFKZDYYNOTN-UHFFFAOYSA-M

Looking for similar products? Visit Product Comparison Guide

Related Categories

General description

Potassium hydroxide is an inorganic salt mainly used as a precursor to synthesize other potassium compounds such as potassium acetate, potassium bicarbonate and potassium carbonate. On a commercial scale, it is synthesized by the electrolysis of potassium chloride.

Application

Potassium hydroxide may be used in the following processes:
  • Conversion of nitriles to amide in tert-butanol.
  • Cross-coupling of aryl halides with different sulfur-, oxygen- and nitrogen-based nucleophiles in dimethyl sulfoxide.
  • As an activator for the preparation of activated carbons from corn cobs.
  • As a base for the N-alkylation of nitrogen heterocycles in polyethylene glycol-ether solvents.
  • Synthesis of (S)-1-(4-benzyl-2-thioxothiazolidin-3-yl)propan-1-one from (S)-phenylalaninol.
  • To catalyze the polymerization of propylene oxide.

Packaging

25, 500, 6×500 g in poly bottle
1, 2.5, 4×2.5 kg in poly bottle
12 kg in fiber drum

pictograms

CorrosionExclamation mark

signalword

Danger

hazcat

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A

storage_class_code

8A - Combustible, corrosive hazardous materials

WGK Germany

WGK 1

Flash Point F

Not applicable

Flash Point C

Not applicable

Certificate of Analysis

Certificate of Origin

A study of the polymerization of propylene oxide catalyzed by anhydrous potassium hydroxide
Steiner EC, et al
Journal of the American Chemical Society, 86(21), 4678-4686 (1964)
Potassium acetate by fermentation with Clostridium thermoaceticum
Shah MM, et al.
Applied Biochemistry and Biotechnology (1997)
Dimethyl Sulfoxide/Potassium Hydroxide: A Superbase for the Transition Metal-Free Preparation of Cross-Coupling Products
Yuan Y, et al
Advanced Synthesis & Catalysis, 352(17), 2892-2898 (2010)
A simple method for converting nitriles to amides. Hydrolysis with potassium hydroxide in tert-butyl alcohol
Hall JH & Gisler M
The Journal of Organic Chemistry, 41(23), 3769-3770 (1976)
Synthesis and diastereoselective aldol reactions of a thiazolidinethione chiral auxiliary
Crimmins MT, et al
Organic Syntheses, 364-376 (2012)

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service