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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

grade

ACS reagent

Quality Level

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

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General description

Potassium hydroxide is an inorganic salt mainly used as a precursor to synthesize other potassium compounds such as potassium acetate,[99] potassium bicarbonate and potassium carbonate.[00] On a commercial scale, it is synthesized by the electrolysis of potassium chloride.[89]

Application

Potassium hydroxide may be used in the following processes:
  • Conversion of nitriles to amide in tert-butanol.
[02]
  • Cross-coupling of aryl halides with different sulfur-, oxygen- and nitrogen-based nucleophiles in dimethyl sulfoxide.
  • [03]
  • As an activator for the preparation of activated carbons from corn cobs.
  • [04]
  • As a base for the N-alkylation of nitrogen heterocycles in polyethylene glycol-ether solvents.
  • [05]
  • Synthesis of (S)-1-(4-benzyl-2-thioxothiazolidin-3-yl)propan-1-one from (S)-phenylalaninol.
  • [06]
  • To catalyze the polymerization of propylene oxide.
  • [07]

    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

    Signal Word

    Danger

    Hazard Statements

    Hazard Classifications

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

    Storage Class Code

    8A - Combustible, corrosive hazardous materials

    WGK

    WGK 1

    Flash Point(F)

    Not applicable

    Flash Point(C)

    Not applicable

    Certificate of Analysis

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    Certificate of Origin

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