Nitric Acid (HNO3) – Properties, Hazards & Uses
Nitric acid (HNO3) is a strong, colorless to slightly yellowish mineral acid with highly corrosive properties, playing an important role in industry, chemistry, and medicine.
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Nitric acid (HNO3) is a strong, colorless to slightly yellowish mineral acid with highly corrosive properties, playing an important role in industry, chemistry, and medicine.
What is Nitric Acid?
Nitric acid (chemical formula: HNO3) is one of the most important mineral acids in chemistry. It is a colorless to slightly yellowish, strongly corrosive liquid with a pungent odor. In concentrated form, it is one of the most aggressive acids known and can cause severe damage to skin, mucous membranes, and many materials.
Properties and Characteristics
Nitric acid is completely water-soluble and a powerful oxidizing agent. Its key properties include:
- Strong acid: It almost completely dissociates in aqueous solution.
- Oxidizing agent: Nitric acid is a strong oxidizer and reacts with many metals, producing nitrogen oxides.
- Corrosive action: Concentrated nitric acid causes characteristic yellow-brown discoloration of the skin (known as the xanthoprotein reaction) and severe chemical burns.
- Fuming nitric acid: At very high concentrations (above 86%), red or white fuming nitric acid forms, which is particularly reactive and hazardous.
Medical and Toxicological Significance
Chemical Burns from Nitric Acid
Contact with nitric acid -- whether on the skin, eyes, or respiratory tract -- constitutes a medical emergency. The acid causes chemical burns that can range from redness and blistering to deep tissue damage, depending on concentration and duration of exposure.
- Skin contact: Immediate yellow discoloration, pain, blistering, and possible tissue necrosis.
- Eye contact: Can lead to severe corneal damage and potential blindness.
- Inhalation: Vapors strongly irritate the airways; high-level exposure can cause pulmonary edema and chemical pneumonitis.
- Ingestion: Causes severe burns to the mouth, esophagus, and stomach.
First Aid for Nitric Acid Exposure
In the event of contact with nitric acid, the following immediate measures are critical:
- Flush affected skin or eyes immediately with large amounts of water for at least 15 to 20 minutes.
- Remove contaminated clothing immediately.
- Call emergency services (911 or local equivalent) or contact a poison control center.
- Do not induce vomiting if ingested.
- Do not attempt neutralization with bases, as this generates additional heat.
Industrial and Scientific Uses
Nitric acid is an indispensable raw material in the chemical industry. Its main applications include:
- Fertilizer production: The majority of globally produced nitric acid is used to manufacture ammonium nitrate and other nitrogen-based fertilizers.
- Explosives manufacturing: Nitric acid is a key precursor in the production of explosives such as TNT and nitroglycerin.
- Metal processing: Used for cleaning, pickling, and surface treatment of metals such as steel and stainless steel.
- Laboratory chemistry: Employed in analytical and synthetic processes, for example in aqua regia (a mixture of hydrochloric and nitric acid) which dissolves even gold and platinum.
- Pharmaceutical industry: Used as a starting material in the synthesis of drugs and other organic compounds.
Biological Role of Nitrogen Compounds
Although nitric acid itself is dangerous to the human body, its ions -- nitrate ions (NO3−) -- play an important role in biology. In human metabolism, nitrate can be converted to nitric oxide (NO), a molecule that dilates blood vessels and improves circulation. Nitrate-rich vegetables such as beetroot are therefore studied in sports medicine and cardiovascular research.
Safety and Storage
Handling nitric acid requires strict safety precautions:
- Wearing personal protective equipment (safety goggles, protective gloves, acid-resistant apron).
- Working in well-ventilated areas or under a fume hood.
- Storing in appropriate acid-resistant containers, separated from flammable materials and alkalis.
- Compliance with hazardous substance regulations according to REACH and GHS labeling standards.
References
- Holleman, A. F.; Wiberg, E.: Inorganic Chemistry. Academic Press, San Diego, 2001.
- European Chemicals Agency (ECHA): Nitric Acid -- Substance Information. https://echa.europa.eu
- National Institute for Occupational Safety and Health (NIOSH): Nitric Acid -- Pocket Guide to Chemical Hazards. https://www.cdc.gov/niosh
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