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Sigma-Aldrich

Potassium hydroxide

puriss. p.a., ≥86% (T), pellets

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Synonym(s):
Caustic potash
Linear Formula:
KOH
CAS Number:
1310-58-3
Molecular Weight:
56.11
EC Number:
215-181-3
MDL number:
MFCD00003553
eCl@ss:
38100303
PubChem Substance ID:
329758915
NACRES:
NA.21

vapor pressure

1 mmHg ( 719 °C)

Quality Level

100

grade

puriss. p.a.

Assay

≥86% (T)

form

pellets

impurities

≤0.0005% total nitrogen (N)
≤0.6% potassium carbonate (K2CO3)

pH

~13.5 (25 °C, 5.6 g/L)

mp

361 °C (lit.)

solubility

alcohol: soluble(lit.)
water: soluble(lit.)

anion traces

chloride (Cl-): ≤50 mg/kg
phosphate (PO43-): ≤5 mg/kg
silicate (as SiO2): ≤5 mg/kg
sulfate (SO42-): ≤40 mg/kg

cation traces

Ag: ≤5 mg/kg
Al: ≤5 mg/kg
Ba: ≤5 mg/kg
Bi: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
Hg: ≤0.1 mg/kg
Li: ≤5 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Mo: ≤5 mg/kg
Na: ≤5000 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Sr: ≤5 mg/kg
Zn: ≤5 mg/kg

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 (KOH, Caustic potash) is a base. It is a water absorbing, colorless solid having rhombic crystals. It has been synthesized by reacting potassium carbonate with calcium hydroxide. It is widely employed for the manufacture of dyes and pigments. Pulverized KOH may be used for the preparation of chalcones.

Application

Potassium hydroxide (KOH) may be employed for the following studies:
  • As an etching agent for the laser modified silica glass. It selectively facilitates etching on exposure to femtosecond laser.
  • As a catalyst for the transformation of palm oil along with methanol to methyl esters, via transesterification reaction.
  • Preparation of potassium hydroxide catalyst supported on palm shell activated carbon, which is used for the transesterification of palm oil.
  • To improve the catalytic efficacy of X, Y and ZSM (Zeolite Socony Mobil)-5 zeolites during the synthesis of methyl methacrylate.

Other Notes

Reagent for the decomposition of silicates by fusion

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Statements

H290 - H302 - H314

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

Regulatory Information

危险化学品

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Tien Duc Pham et al.
Polymers, 12(1) (2020-01-08)
The present study aims to investigate adsorptive removal of molecular ciprofloxacin using protein-modified nanosilica (ProMNS). Protein was successfully extracted from Moringa seeds while nanosilica was synthesized from rice husk. Fourier-transform infrared (FTIR), ultraviolet visible (UV-Vis) and high-performance liquid chromatography (HPLC)
Z. Sulcek et al.
Methods of Decomposition in Inorganic Analysis (1989)
R. Bock
Aufschlussmethoden der anorg. & org. Chemie (1972)
Eagleson M.
Concise Encyclopedia Chemistry, 888-888 (1994)
Kinetics of palm oil transesterification in a batch reactor.
Darnoko D and Cheryan M.
Journal of the American Oil Chemists' Society, 77(12), 1263-1267 (2000)
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