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CAS number 7722-64-7
Synonyms: Permanganic acid, potassium salt; Condy's crystals
CAS No.: 7722-64-7
Molecular Weight: 158.03
Chemical Formula: KMnO4
EC number 231-760-3
UN number 1490
RTECS number SD6475000
Molar mass 158.03 g/mol
Appearance purplish-bronze-gray needles, magenta–rose in soln.
Density 2.703 g/cm3
Melting point 240 °C decomp.
Solubility in water 6.38 g/100 ml at 20 °C
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
MSDS External MSDS
EU Index 025-002-00-9
EU classification Oxidant (O)
Dangerous for the environment (N)
R-phrases R8, R22, R50/53
S-phrases (S2), S60, S61
Flash point Non-flammable
Potassium permanganate is the inorganic chemical compounda water soluble
salt consisting of equal mole amounts of potassium (K+) and permanganate
(MnO4-, officially called manganate (VII) ) ions. This salt, formerly
known as permanganate of potash or Condy's crystals is a strong
oxidizing agent. It dissolves in water to give deep purple solutions,
evaporation of which gives prismatic purplish-black glistening
crystals. In 2000, worldwide production was estimated at 30 000
tonnesIn this compound, manganese is in the +7 oxidation state.
Almost all applications of potassium permanganate exploit its oxidizing
Ass a strong oxidant that does not generate toxic byproducts, KMnO4 has
many niche uses. One of the uses can be said to be as a fixative.
Disinfectant and water treatment
As an oxidant, potassium permanganate can act as a disinfectant. For
example, dilute solutions are used to treat canker sores (ulcers),
disinfectant for the hands and treatment for mild pompholyx,
dermatitis, and fungal infections of the hands or feet
Potassium permanganate, obtainable at pool supply stores, is used in
rural areas to remove iron and hydrogen sulfide (rotten egg smell) from
well and waste water.
Related to the use of KMnO4 for water treatment, this salt is often
employed as a specialized disinfectant for treating human and animal
ailments. It has been used to induce abortions, although with risks.
In histology to bleach melanin which obscures tissue detail. Potassium
permanganate can also be used to differentiate amyloid AA from other
types of amyloid pathologically deposited in body tissues. Incubation of
fixed tissue with potassium permanganate will prevent amyloid AA from
staining with congo red whereas other types of amyloid are unaffected.
DANGER! STRONG OXIDIZER. CONTACT WITH OTHER MATERIAL MAY CAUSE FIRE.
CORROSIVE. CAUSES BURNS TO ANY AREA OF CONTACT. HARMFUL IF SWALLOWED OR
INHALED. Potential Health Effects Inhalation:
Causes irritation to the respiratory tract. Symptoms may include
coughing, shortness of breath. High concentrations can cause pulmonary
Ingestion of solid or high concentrations causes severe distress of
gastro-intestinal system with possible burns and edema; slow pulse;
shock with fall of blood pressure. May be fatal. Ingestion of
concentrations up to 1% causes burning of the throat, nausea, vomiting,
and abdominal pain; 2-3% causes anemia and swelling of the throat with
possible suffocation; 4-5% may cause kidney damage.
Dry crystals and concentrated solutions are caustic causing redness,
pain, severe burns, brown stains in the contact area and possible
hardening of outer skin layer. Diluted solutions are only mildly
irritating to the skin.
Eye contact with crystals (dusts) and concentrated solutions causes
severe irritation, redness, blurred vision and can cause severe damage,
Prolonged skin contact may cause irritation, defatting, and dermatitis.
Chronic manganese poisoning can result from excessive inhalation
exposure to manganese dust and involves impairment of the central
nervous system. Early symptoms include sluggishness, sleepiness, and
weakness in the legs. Advanced cases have shown symptoms of fixed facial
expression, emotional disturbances, spastic gait, and falling.
Aggravation of Pre-existing Conditions:
No information found.
Handling and Storage
Keep in a tightly closed container, stored in a cool, dry, ventilated
area. Protect against physical damage and moisture. Isolate from any
source of heat or ignition. Avoid storage on wood floors. Separate from
incompatibles, combustibles, organic or other readily oxidizable
materials. Containers of this material may be hazardous when empty since
they retain product residues (dust, solids); observe all warnings and
precautions listed for the product.
Notification: These chemicals are designated as those that are used
in the manufacture of the controlled substances and are important to
the manufacture of the substances. For any (Control Substance)
products Import and Export *** subjected to your country government
laws /control substance ACT.
Information: The information on this web page is provided to help
you to work safely, but it is intended to be an overview of hazards,
not a replacement for a full Material Safety Data Sheet (MSDS). MSDS
forms can be downloaded from the web sites of many chemical
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Congress of the United States as Title II of the Comprehensive Drug
Abuse Prevention and Control Act of 1970. The CSA is the federal
U.S. drug policy under which the manufacture, importation,
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