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Potassium permanganate
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Potassium permanganate is an inorganic compound with the chemical formula KMnO4 and composed of K+ and MnO−
4. It is a purplish-black crystalline salt, that dissolves in water to give intensely pink or purple solutions.
Potassium permanganateNamesIUPAC name
Potassium manganate(VII)
Other names
Potassium permanganate
Chameleon mineral
Condy's crystals
Permanganate of potash
Hypermangan
Identifiers
CAS Number
7722-64-7 
3D model (JSmol)
Interactive image
ChEMBL
ChEMBL3833305
ChemSpider
22810
DrugBank
DB13831
ECHA InfoCard100.028.874 EC Number
231-760-3
KEGG
D02053 
PubChem CID
516875
RTECS number
SD6475000
UNII
00OT1QX5U4
UN number1490
CompTox Dashboard (EPA)
DTXSID2034839 
InChI
InChI=1S/K.Mn.4O/q+1;;;;;-1 
Key: VZJVWSHVAAUDKD-UHFFFAOYSA-N 
SMILES
[K+].[O-][Mn](=O)(=O)=O
Properties
Chemical formula
KMnO4Molar mass158.034 g/molAppearancePurplish-bronze-gray needles
Magenta–rose in solution[1]OdorodorlessDensity2.7 g/cm3[2]:4.83Melting point240 °C (464 °F; 513 K) (decomposes)
Solubility in water
76 g/L (25 °C)[2]
250 g/L (65 °C)Solubilitydecomposes in alcohol and organic solvents
Magnetic susceptibility (χ)
+20.0·10−6 cm3/mol[2]:4.134
Refractive index (nD)
1.59Structure[3]
Crystal structure
Orthorhombic, oP24
Space group
Pnma, No. 62
Lattice constant
a = 0.909 nm, b = 0.572 nm, c = 0.741 nm
Formula units (Z)
4Thermochemistry
Heat capacity (C)
119.2 J/mol K
Std molar
entropy (So298)
171.7 J K−1 mol−1
Std enthalpy of
formation (ΔfH⦵298)
−813.4 kJ/mol
Gibbs free energy (ΔfG˚)
-713.8 kJ/mol