Description

Potassium permanganate
IUPAC name: Potassium manganate
Other names: Potassium permanganate Potassium manganate
CAS number 7722-64-7 Y  
EC number 231-760-3
UN number 1490 KEGG D02053 RTECS number SD6475000
Properties Molecular formula KMnO4
Molar mass 158.034 g/mol
Appearance purplish-bronze-gray needles magenta–rose in solution
Odor odorless
Density 2.703 g/cm3
Melting point 240 °C decomp.
Solubility in water 6.38 g/100 ml (20 °C) 25 g/100 mL (65 °C) Solubility decomposes in alcohol and organic solvents Structure Crystal structure Orthorhombic Thermochemistry Std enthalpy of formation ΔfHo298 −813.4 kJ/mol Standard molar entropy So298 171.7 J K–1 mol–1 Hazards MSDS External MSDS EU Index 025-002-00-9 EU classification Oxidant (O) Harmful (Xn) Dangerous for the environment (N) Non-Flammable R-phrases R8, R22, R50/53 S-phrases (S2), S60, S61 NFPA 704 020OXRelated compounds Other anions Potassium manganite Potassium manganate Other cations Sodium permanganate Ammonium permanganate Related compounds Manganese heptoxide Y.  Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)