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Potassium permanganate

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Potassium permanganate CAS number 7722-64-7








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Potassium permanganate

CAS number 7722-64-7

Potassium permanganate Formula: KMnO4                                     Potassium permanganate powder


Synonyms: Permanganic acid, potassium salt; Condy's crystals
CAS No.: 7722-64-7
Molecular Weight: 158.03
Chemical Formula: KMnO4
PubChem 24400
EC number 231-760-3
UN number 1490
KEGG D02053
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)
Harmful (Xn)
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.[1] 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 properties
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,[3][4] 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.
Biomedical uses

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.

Hazards Identification


Causes irritation to the respiratory tract. Symptoms may include coughing, shortness of breath. High concentrations can cause pulmonary edema.
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.
Skin Contact:
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:
Eye contact with crystals (dusts) and concentrated solutions causes severe irritation, redness, blurred vision and can cause severe damage, possibly permanent.
Chronic Exposure:
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.


Note /Government 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 suppliers. ,also that the information on the PTCL Safety web site, where this page was hosted, has been copied onto many other sites, often without permission. If you have any doubts about the veracity of the information that you are viewing, or have any queries, please check the URL that your web browser displays for this page. If the URL begins " Benzoate.htm/" the page is maintained by the Safety Officer in Physical Chemistry at Oxford University. If not, this page is a copy made by some other person and we have no responsibility for it.
The Controlled Substances Act (CSA) was enacted into law by the Congress of the United States as Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970.[1] The CSA is the federal U.S. drug policy under which the manufacture, importation, possession, use and distribution of certain substances is regulated. The Act also served as the national implementing legislation for the Single Convention on Narcotic Drugs

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