Oxalic acid

Oxalic acid is a naturally occurring dicarboxylic acid with the chemical formula C2H2O4 and CAS number 144-62-7. It has a molecular weight of 90.03 g/mol and appears as colorless crystals. This organic compound is found naturally in many plants including spinach, rhubarb, and sorrel. Industrially, it serves as an important chemical intermediate and cleaning agent due to its strong reducing and chelating properties.

Oxalic acid is a white crystalline solid at room temperature with no distinctive odor. It is highly soluble in water and alcohol but poorly soluble in organic solvents. The compound has a melting point of approximately 189°C and decomposes before boiling. It forms stable dihydrate crystals under normal conditions and exhibits strong acidic properties with two ionizable hydrogen atoms, making it a diprotic acid.

Oxalic acid is used primarily as a cleaning and bleaching agent, particularly for removing rust stains and mineral deposits. It serves as a reducing agent in photography and textile industries. The compound is utilized in metal polishing, wood bleaching, and as a mordant in dyeing processes. Additionally, it functions as a chemical intermediate in pharmaceutical synthesis and as a laboratory reagent for analytical chemistry applications.

Oxalic acid requires careful handling as it carries Acute Tox. 4 classification with GHS07 pictogram and Warning signal word. Wear appropriate personal protective equipment including safety goggles, gloves, and protective clothing. Ensure adequate ventilation when handling to avoid inhalation of dust particles. Avoid direct skin and eye contact, and never ingest the substance. Work in well-ventilated areas and have emergency washing facilities readily available.

Oxalic acid should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources and direct sunlight. Keep containers away from incompatible materials such as strong bases, oxidizing agents, and metals. Store in original packaging with proper labeling intact. Ensure storage areas are equipped with appropriate spill containment measures and maintain temperatures below 25°C to prevent decomposition and maintain product stability.

In case of skin contact with oxalic acid, immediately remove contaminated clothing and flush affected area with plenty of water for at least 15 minutes. For eye contact, rinse thoroughly with clean water for at least 15 minutes and seek immediate medical attention. If ingested, do not induce vomiting, rinse mouth with water and seek immediate medical care. For inhalation, move person to fresh air and monitor breathing.

Oxalic acid disposal must comply with local, national, and EU waste regulations as it is classified as hazardous waste. Small quantities can be neutralized carefully with sodium bicarbonate solution under controlled conditions before disposal. Large quantities require professional hazardous waste disposal services. Never dispose of oxalic acid in regular drains or municipal waste systems. Contact licensed waste management companies for proper collection, treatment, and disposal according to regulatory requirements.

Oxalic acid is classified under ADR as Class 8 (corrosive substances), Packing Group III for transportation purposes. It must be packaged in UN-approved containers with proper hazard labels and documentation. Transport vehicles must carry appropriate emergency equipment and drivers require ADR certification. Ensure packages are properly secured, labeled, and accompanied by transport documents including safety data sheets for emergency response purposes.

Oxalic acid is subject to standard EU chemical regulations including REACH registration and CLP classification requirements but is not listed as a Substance of Very High Concern (SVHC). It must be supplied with compliant safety data sheets and appropriate hazard labeling showing Acute Tox. 4 classification. Industrial users must comply with occupational exposure limits and workplace safety regulations. No specific restrictions apply beyond standard chemical safety requirements.

Oxalic acid is available throughout Europe from OYSI, a specialized chemical distributor offering high-quality industrial chemicals to professional customers. OYSI provides reliable supply chain management with proper documentation, safety data sheets, and regulatory compliance. The company serves various industries across European markets with technical support and customized packaging solutions. Contact OYSI directly for quotations, availability, and delivery options in your region.