Product

Oxalic acid also known as ethanedioic acid is a simple dicarboxylic acid with the structure (HOOC)-(COOH). It is one of the strongest acid among the organic acids. It is corrosive and toxic nature. It was first discovered in 1769 by the German pharmacist Johann Christian Wiegleb in the plant Oxalis acetosella, from which the name “oxalic acid” is derived. In the year 1776, Oxalic acid was prepared synthetically for the first time by Scheele. It is found unsurprisingly in varying concentrations, occurring in several plants such as tea, rhubarb, spinach, cocoa, nuts, berries and beans.

It is readily oxidized, this characteristic property makes it useful as a reducing agent for photography, bleaching, and ink removal. Oxalic acid is strong that it is widely applied industrially for bleaching and heavy-duty cleaning, notably for rust removal.

It is best known agent in wood bleaching. Oxalic acid is capable of cleaning wood from its gray colour due to continuous exposure to sun light. This can be done by rubbing oxalic acid on the affected wood can lighten its gray form. It is used to clean and sterilize home brewing utensils used to make beer and wine. It also used as a purifier in the pharmaceutical industry and also used by rock collectors to clean a variety of minerals and related specimens.

It is used to remove hard water stains from tile and plumbing fixtures. It is also used in removing of paint and varnishes, as an auto radiator cleanser and as a disinfectant to control bacteria and germs. It is used in commercial rust removers to eradicate rust stains from tubs, sinks and tile, as well as from metal. Oxalic acid is feasible option for beekeepers to control mites. In the field of mineral processing it is used as a precipitating agent. It is also used in the treatment of wastewater, because oxalic acid helps take away calcium from water.

PRODUCT IDENTIFICATION

CAS No. : 144-62-7
Molecular formula : H2C2O4
Molar mass : 90.03 g mol−1
Appearance : White crystals
Density : 1.90 g cm-3
Melting point : 189-191 °C, 462-464 K
Boiling Point : Sublimes
Solubility in water : 14.3 g/100ml (25 °C)
Solubility in ethanol : 23.7 g/100ml (15 °C)
Solubility in diethyl ether : 1.4 g/100ml (15 °C) in
Acidity (pKa) : 1.25, 4.14

PRODUCT IDENTIFICATION
CAS NO. 144-62-7 (Anhydrous), 6153-56-6 (Dihydrate)
EINECS NO. 205-634-3
FORMULA C2H2O4 (anhydrous), C2H2O4·2H2O (Dihydrate),   HOOCCOOH.2H2O
MOL WT. 126.07
TOXICITY Oral rat LD50: 7500 mg/kg
SYNONYMS Ethanedioic acid, dihydrate; Oxalsäure (German); ácido oxálico (Spanish); Acide oxalique (French);
PHYSICAL AND CHEMICAL PROPERTIES (DIHYDRATE)
PHYSICAL STATE White crystals
MELTING POINT 101 – 102 C
BOILING POINT 149 – 160 C (sublimes)
SPECIFIC GRAVITY 1.6 – 1.7
SOLUBILITY IN WATER 1g/7ml
VAPOR DENSITY 4.4
NFPA RATINGS Health: 3; Flammability: 1; Reactivity: 0
FLASH POINT 163 C
STABILITY Stable under ordinary conditions
HANDLING AND STORAGE
Keep in a tightly closed container. Protect from physical damage. Store in a cool, dry, ventilated area away from sources of heat, moisture and incompatibilities. Containers of this material may be hazardous when empty since they retain product residues (dust, solids); observe all warnings and precautions listed for the product.
FIRST AID MEASURES
Inhalation:
Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Call a physician immediately.
Ingestion:
DO NOT INDUCE VOMITING! Give large quantities of limewater or milk to drink. Never give anything by mouth to an unconscious person. Call a physician immediately.
Skin Contact:
In case of contact, wipe off excess from skin then immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Call a physician immediately.
Eye Contact:
Immediately flush eyes with gentle but large stream of water for at least 15 minutes, lifting lower and upper eyelids occasionally. Call a physician immediately.
FIRE FIGHTING MEASURES
Fire:
Oxalic Acid is a combustible solid below 101C (215F)
Explosion:
Reacts explosively with strong oxidizing materials and some silver compounds.
Fire Extinguishing Media:
Water spray, dry chemical, alcohol foam, or carbon dioxide. Foam or water on molten oxalic acid may cause frothing. Water spray may be used to keep fire exposed containers cool.
Special Information:
In the event of a fire, wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full face piece operated in the pressure demand or other positive pressure mode.
ACCIDENTAL RELEASE MEASURES
Remove all sources of ignition. Ventilate area of leak or spill. Wear appropriate personal protective equipment as specified in Section 8.Spills: Clean up spills in a manner that does not disperse dust into the air. Use non-sparking tools and equipment. Pick up spill for recovery or disposal and place in a closed container. Remove unnecessary people. If material comes in contact with water, neutralize liquid with alkaline material (soda ash, lime), then absorb with an inert material (e.g. vermiculite, dry sand, earth) and place in a chemical waste container. Do not use combustible materials, such as saw dust. Do not flush to sewer.

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