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CAS NO. *******7 (Anhydrous), ********6 (Dihydrate) EINECS NO. ********3 FORMULA HOOCCOOH·2H2O MOL WT. **6.*7 H.S. CODE TOXICITY Oral rat LD*0: ***0 mg/kg SYNONYMS Ethanedioic acid, dihydrate; Oxalsäure (German); ácido oxálico (Spanish); Acide oxalique (French) DERIVATION CLASSIFICATION GENERAL DESCRIPTION Oxalic Acid (also called Ethanedioic Acid) is a colourless, crystalline, toxic organic compound belonging to the family of dicarboxylic acids; melting at **7 C; soluble in water, alcohol, and ether. It occurs in the form of its metal salts (usually calcium or potassium) in many plants. It is commercially manufactured by heating sodium formate in the presence of an alkali catalyst to form sodium oxalate, which should be converted to free oxalic acid when treated with sulfuric acid. It is also prepared by oxidizing carbohydrates with nitric acid, by heating saw dust with caustic alkalies or by fermentation of sugar solutions in the presence of certain molds. Oxalic acid is the only possible compound in which two carboxyl groups are joined directly; for this reason oxalic acid is one of the strongest acids in organic compounds. Unlike other carboxylic acids, oxalic acid (and formic acid) is readily oxidized and combine with calcium, iron, sodium, magnesium, or potassium to form less soluble salts called oxalates. Oxalic acid and oxalates are useful as reducing agents for photography, bleaching, and rust removal. They are widely used as an purifying agent in pharmaceutical industry, precipitating agent in rare-earth metal processing, bleaching agent in textile and wood industry, rust-remover for metal treatment, grinding agent, waste water treatment. acid rinse in laundries and removing scale from automobile radiators. PHYSICAL AND CHEMICAL PROPERTIES (DIHYDRATE) PHYSICAL STATE white crystals MELTING POINT **1 - **2 C BOILING POINT **9 - **0 C (sublimes) SPECIFIC GRAVITY 1.6 - 1.7 SOLUBILITY IN WATER 1 g/7ml pH VAPOR DENSITY 4.4 AUTOIGNITION REFRACTIVE INDEX NFPA RATINGS Health: 3; Flammability: 1; Reactivity: 0 FLASH POINT **3 C STABILITY Stable under ordinary conditions APPLICATIONS Purifying agent, Precipitating agent, Bleaching agent, Metal treatment, Grinding agent, Waste water treatment, Reducing agent SALES SPECIFICATION APPEARANCE white crystals TOTAL ACIDITY *9.5% min ASH 0.1% max IRON 0.*2% max LOSS ON IGNITION 0.*8% max SULFATE 0.1% max CHLORIDE *0ppm max HEAVY METAL *0ppm max TRANSPORTATION PACKING *5kgs in bag
