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Potassium Hydroxide Solution (KOH) – Uses & Safety

Potassium hydroxide solution (KOH) is a strongly caustic base used in medicine, industry, and food processing.

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Things worth knowing about "Potassium hydroxide solution"

Potassium hydroxide solution (KOH) is a strongly caustic base used in medicine, industry, and food processing.

What is Potassium Hydroxide Solution?

Potassium hydroxide solution (commonly known as caustic potash) is an aqueous solution of potassium hydroxide (KOH), a strong inorganic base. It is colorless, highly corrosive, and used across medical, industrial, and food-related fields. In medicine, it serves primarily as a diagnostic reagent and in select therapeutic applications.

Chemical Properties

Potassium hydroxide dissociates completely in water into potassium ions (K¹♠) and hydroxide ions (OH−), resulting in a strongly alkaline solution with a pH typically above 13. This high alkalinity enables it to break down proteins, fats, and organic tissue.

Chemical formula: KOH
Molecular weight: 56.11 g/mol
pH (concentrated solution): above 13
Physical state: solid (pellets or flakes) or aqueous solution

Medical Applications

Diagnostics: KOH Preparation

In dermatology and mycology, a diluted potassium hydroxide solution (10–20%) is used as a KOH preparation to diagnose fungal infections of the skin, nails, or hair under a microscope. Skin scrapings or nail samples are treated with KOH to dissolve human cells, making fungal elements (hyphae, spores) visible for examination.

Therapeutic Use

Concentrated potassium hydroxide (e.g., 5% KOH) is applied topically for the treatment of molluscum contagiosum, a common viral skin condition especially in children. Its caustic action selectively destroys infected tissue and promotes healing.

Industrial and Food Applications

Potassium hydroxide is also used in the food industry as a food additive (E525) for pH regulation, for example in the production of cocoa products, olives, and pretzels. In the chemical industry, it serves as an electrolyte in alkaline batteries, as a cleaning agent, and in soap and fertilizer manufacturing.

Caustic Effects and Toxicity

Potassium hydroxide solution is strongly corrosive and can cause severe chemical burns upon contact with skin or mucous membranes. Ingestion leads to serious injuries of the esophagus and stomach. Inhalation of vapors or aerosols can damage the respiratory tract.

Skin contact: rinse immediately with large amounts of water for at least 15 minutes
Eye contact: rinse immediately and seek medical attention
Ingestion: do not induce vomiting; call emergency services (911 / 112) and a poison control center immediately
Inhalation: move to fresh air; seek medical help if breathing difficulties occur

First Aid and Safety Guidelines

Appropriate protective equipment is essential when handling potassium hydroxide solution: safety goggles, acid-resistant gloves, and protective clothing as needed. In the event of an accident, contact poison control or emergency services immediately.

References

World Health Organization (WHO): Chemical Safety – Potassium Hydroxide. www.who.int
European Food Safety Authority (EFSA): Re-evaluation of potassium hydroxide (E 525) as a food additive. EFSA Journal, 2013.
Habif T.P. - Clinical Dermatology: A Color Guide to Diagnosis and Therapy. Elsevier, 2016.

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