2. As reducing agent: it is mainly used in the production of hydroquinone, pentaerythritol, cobalt oxalate, nickel oxalate, gallic acid and other chemical products in organic synthesis industry. In addition, oxalic acid can also be used to synthesize oxalate, oxalate, oxamide and other products, among which diethyl oxalate, sodium oxalate and calcium oxalate have the largest output.
3. As a mordant: Antimony oxalate can be used as a mordant, and ammonium ferric oxalate is a reagent for printing blueprints.
4. Rust removal function: oxalic acid can be used for rust removal. But be careful when using, oxalic acid is very corrosive to stainless steel. High concentration of oxalic acid is also easy to corrode hands. After the skin comes into contact with oxalic acid, it should be washed with water in time.
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Extended data:
Oxalic acid, also known as oxalic acid, widely exists in plant-derived foods. Oxalic acid is a colorless columnar crystal, which is soluble in water and insoluble in organic solvents such as ether.
Oxalate has a strong coordination effect and is another metal chelating agent in plant-derived foods. When oxalic acid is combined with some alkaline earth metal elements, its solubility is greatly reduced, such as calcium oxalate is almost insoluble in water.
Therefore, the existence of oxalic acid has a great influence on the bioavailability of essential minerals; When oxalic acid is combined with some transition metal elements, due to the coordination of oxalic acid, soluble complexes are formed, and the solubility is greatly increased.
Oxalic acid is widely distributed in nature, and often exists in the cell membranes of plants such as Funiu flower, sheep hoof, Oxalis, Rumex, etc. Almost all plants contain calcium oxalate. Oxalic acid is a common component in plants, especially herbs, and mostly exists in the form of potassium salt or calcium salt. Begonia and plantain exist as free acids.
References:
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