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60370 Sigma-Aldrich

Potassium hydroxide

puriss. p.a., ≥86% (T), pellets

Synonym: Caustic potash

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Properties

Related Categories Acids & Bases, Analytical Reagents, Analytical Reagents for General Use, Analytical/Chromatography, Bases,
Quality Level   100
vapor pressure   1 mmHg ( 719 °C)
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

Description

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

Safety & Documentation

Safety Information

Symbol 
Signal word 
Danger
Hazard statements 
RIDADR 
UN 1813 8 / PGII
WGK Germany 
WGK 1
RTECS 
TT2100000
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable
Protocols & Articles

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