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Potassium permanganate

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Identification
Molecular formula
KMnO4
CAS number
7722-64-7
IUPAC name
potassium;permanganate
State
State

At room temperature, potassium permanganate is a solid. It is readily soluble in water and forms deeply colored solutions. The crystalline nature and vibrant color make it easily recognizable.

Melting point (Celsius)
240.00
Melting point (Kelvin)
513.15
Boiling point (Celsius)
100.00
Boiling point (Kelvin)
373.15
General information
Molecular weight
158.03g/mol
Molar mass
158.0340g/mol
Density
2.7030g/cm3
Appearence

Potassium permanganate appears as dark purple or almost black crystals. It is known for its characteristic intense purple-violet color in solution, owing to the permanganate ion's strong light absorption properties. When dissolved in water, it imparts a pink to deep purple coloration depending on the concentration.

Comment on solubility

Solubility of Potassium Permanganate

Potassium permanganate (KMnO4) is a fascinating compound known for its distinct purple color and oxidizing properties. One of the most notable features of potassium permanganate is its solubility in water, which allows it to be easily utilized in various applications. Here are some key points about its solubility:

  • Highly Soluble: Potassium permanganate is highly soluble in water, with solubility rates around 6.4 g per 100 mL at 20 °C.
  • Aqueous Solution: When dissolved in water, it forms a deep purple solution, which is often used for its antiseptic and oxidizing properties.
  • Temperature Effect: The solubility tends to increase with temperature; warmer water can dissolve more potassium permanganate.
  • Solvent Specificity: While it is soluble in water, potassium permanganate shows limited solubility in organic solvents, making it a versatile yet specific compound in chemical reactions.

In summary, potassium permanganate's excellent solubility in water underlines its importance in both laboratory and practical applications, including disinfection and analytical chemistry. Its striking purple solution is not only visually compelling but also highlights the compound's reactivity and utility in various chemical processes.

Interesting facts

Interesting Facts about Potassium Permanganate

Potassium permanganate is a fascinating compound with a rich history and numerous applications across various fields. Here are some captivating aspects of this remarkable chemical:

  • Oxidizing Agent: Potassium permanganate is renowned for its strong oxidizing properties. It is commonly used in redox reactions, making it a vital component in laboratories and industrial processes.
  • Medical Uses: Due to its antiseptic qualities, potassium permanganate is often used in diluted solutions to treat skin infections and fungal conditions. Historically, it has been utilized for its disinfectant properties.
  • Water Purification: In water treatment facilities, potassium permanganate acts as a powerful agent to remove contaminants. It effectively oxidizes iron and manganese, improving the quality of drinking water.
  • Historical Significance: The compound was first discovered in the early 18th century and has since played a crucial role in chemical research and development.
  • Color Change Indicator: Its intense purple color serves as an excellent visual indicator during titrations. As potassium permanganate is reduced, the color fades, providing a clear, observable change that students often find engaging.
  • Environmental Considerations: While potassium permanganate is useful, it’s important to handle it with care. It can be harmful in high concentrations and may present risks to aquatic life if released into waterways.

In conclusion, potassium permanganate is not just a compound in the chemical world; it is a versatile agent with practical applications in medicine, environmental science, and beyond. Its striking color and oxidizing capabilities make it a subject of interest for both chemistry students and professional scientists alike. As Dr. Marie Curie once said, "Nothing in life is to be feared, it is only to be understood."