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| CAS number | 109-72-8 |
| Molecular formula | C4H9Li |
| Product name | n-Butyllithium |
| Molecular Structure |  |
Appearance：Clear, yellow solution. Commercially available as solutions (15%, 25%, 2 M, 2.5 M, 10 M, etc.) in alkanes such as pentane, hexanes, or heptanes.
Density：0.68 g/mL at 20ºC
Boiling Point：80ºC
Melting Point：80ºC
Flash Point：10 °F
Water Solubility：vigorous reaction
Stability：Stable under normal temperatures and pressures.
Storage Condition：2-8ºC
CAS No. 109-72-8 is an organic compound known as Oxalic Acid, a colourless crystalline solid, and an important industrial reagent. Oxalic acid is used primarily in metal processing, operating as a powerful reducing agent, bleaching agent, and chelating agent.
In metal processing, oxalic acid is used to dissolve certain types of oxide deposits. It is especially effective in dissolving ferric oxide and manganese oxide deposits found in automobile radiators, steam systems and other equipment. In addition, it is used to clean metals from the effects ofscale, rust and corrosion. Due to its strong acidity, its primary use in electrolytic plating is as an acidulating electrolyte, for finishing stainless steel, zirconium, lead, nickel and chromium.
Oxalic acid functions as a bleaching agent for textile dyes and for leather, and as a reprolonger or light fastener for fabric dyes. It is also used in detergent formulations to provide cleaning properties and to enhance the removal of stains.
In chemistry, oxalic acid is used as a reducing agent in certain reactions, becoming decrystallized in alcoholic solutions. The acid facilitates the preparation of numerous metals, such as titanium and vanadium, by the reduction of their chlorides. It is also used as a chelating agent, combining with trace elements in raw materials so that they can be readily removed.
Oxalic acid can also be used in woodworking. It is found in certain wood bleach concoctions and pastes, as well as a component of primers and furniture refinishers.
Oxalic acid is a toxic compound, and should only be handled in well-ventilated areas to reduce risks of inhalation. When mixed in solution, measures should be taken to use appropriate protective gear and to avoid contact with skin. When mixed with water, oxalic acid readily breaks down into toxic oxalate anions and hydrogen ions, meaning that proper disposal is necessary.
