Oxalic acid is a subcategory of carboxylic acids and carboxylate salts. It is an organic compound with the chemical formula H ₂ C ₂ O ₄. It is a metabolic product of living organisms, a binary weak acid, widely distributed in plants, animals, and fungi, and plays different functions in different living organisms. Research has found that over a hundred types of plants are rich in oxalic acid, especially spinach, amaranth, sugar beet, purslane, taro, sweet potato, and rhubarb, which have the highest content. Due to its ability to reduce the bioavailability of mineral elements, oxalic acid can easily form calcium oxalate with calcium ions in the human body, leading to kidney stones. Therefore, oxalic acid is often considered an antagonist to the absorption and utilization of mineral elements. Its anhydride is carbon trioxide.
Complex agents, masking agents, precipitants, reducing agents. Used in analysis to verify and determine metal ions such as beryllium, calcium, chromium, gold, manganese, strontium, thorium, etc. Microscopic microcrystalline analysis for sodium and other elements. Precipitate calcium, magnesium, thorium, and rare earth elements. Standard solution for calibrating potassium permanganate and cerium sulfate solutions. Bleach. Dyeing aids. It can also be used to remove rust from clothes. In the construction industry, before applying exterior wall paint, due to the strong alkalinity of the wall, oxalic acid should be applied first to remove alkalinity. The pharmaceutical industry is used to manufacture drugs such as chloramphenicol, tetracycline, streptomycin, borneol, vitamin B12, and phenobarbital. The printing and dyeing industry is used as a coloring aid, bleaching agent, and pharmaceutical intermediate. The plastic industry is used to produce polyvinyl chloride, amino plastics, and urea formaldehyde plastics. Used as a catalyst for the synthesis of phenolic resins, the catalytic reaction is mild, the process is relatively stable, and the duration is the longest. Acetone oxalate solution can catalyze the curing reaction of epoxy resin and shorten the curing time. It is also used as a pH regulator in the synthesis of urea formaldehyde resin and melamine formaldehyde resin. Polyvinyl formaldehyde water-soluble adhesive can also be added to improve drying speed and bonding strength. Also used as a curing agent and metal ion chelating agent for urea formaldehyde resins. It can be used as a promoter for the preparation of starch adhesive using KMnO4 oxidant, accelerating the oxidation rate and shortening the reaction time. Oxalic acid is mainly used as a reducing agent and bleaching agent in the production of antibiotics, borneol and other drugs, as well as a solvent for extracting rare metals, dye reducing agents, tanning agents, etc. Oxalic acid can also be used in the production of cobalt molybdenum aluminum catalysts, cleaning of metals and marble, and bleaching of textiles. Used for metal surface cleaning and treatment, rare earth element extraction, textile printing and dyeing, leather processing, catalyst preparation, etc. Oxalic acid is mainly used as a reducing agent in the organic synthesis industry to produce chemical products such as hydroquinone, pentaerythritol, cobalt oxalate, nickel oxalate, and gallic acid. The plastic industry is used to produce polyvinyl chloride, amino plastics, urea formaldehyde plastics, paint films, etc. The dye industry is used to manufacture salt based green products, etc. The printing and dyeing industry can replace acetic acid as a coloring aid and bleaching agent for pigment dyes. The pharmaceutical industry is used to manufacture tetracycline, tetracycline, streptomycin, and ephedrine. In addition, oxalic acid can also be used to synthesize various products such as oxalate esters, oxalates, and oxalamides, with higher yields of diethyl oxalate, sodium oxalate, calcium oxalate, and others. Oxalic acid can be used as a mordant, while antimony oxalate can be used as a mordant, and ammonium iron oxalate is a reagent for printing blueprints. Oxalic acid rust removal function Oxalic acid can be used for rust removal: buy a bottle of oxalic acid from a chemical reagent store, take some, prepare a solution with warm water, and apply it to the rust stain to wipe. Then use metallographic sandpaper to wipe, and finally spray paint. Stores selling oxalic acid usually also sell some medical equipment and glass instruments. (Attention: Be careful when using, oxalic acid has strong corrosiveness to stainless steel. High concentrations of oxalic acid can also corrode hands. The generated acid oxalate has a high solubility, but it has a certain toxicity. Do not consume it when using. After skin contact with oxalic acid, it should be washed with water in a timely manner.)