1. As a bleaching agent: Oxalic acid is mainly used as a reducing agent and bleaching agent. It is used to produce drugs such as antibiotics and borneol, as well as solvents for refining rare metals, dye reducing agents, tanning agents, etc.

2. As a reducing agent: In the organic synthesis industry, it is mainly used to produce chemical products such as hydroquinone, pentaerythritol, cobalt oxalate, nickel oxalate, and gallic acid. In addition, oxalic acid can also be used to synthesize various oxalate esters, oxalates, and oxalamides, among which diethyl oxalate, sodium oxalate, and calcium oxalate have the largest yields.

3. As a mordant: Antimony oxalate can be used as a mordant, and ferric ammonium oxalate is a chemical for printing blueprints.

4. Rust removal function: Oxalic acid can be used to remove rust. However, be careful when using it, as oxalic acid is highly corrosive to stainless steel. High concentrations of oxalic acid can also easily corrode hands. After the skin comes into contact with oxalic acid, it should be washed with water promptly.

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Extended information:

Oxalic acid Also known as oxalic acid, it is widely present in plant-source foods. Oxalic acid is a colorless columnar crystal that is easily soluble in water but insoluble in organic solvents such as ether.

Oxalate root has a strong coordination effect and is another type of metal chelating agent in plant-source foods. When oxalic acid is combined with some alkaline earth metal elements, its solubility is greatly reduced. For example, calcium oxalate is almost insoluble in water.

Therefore, the presence of oxalic acid has a great impact on the bioavailability of essential minerals; when oxalic acid is combined with some transition metal elements, a soluble complex is formed due to the coordination effect of oxalic acid, and its solubility greatly increased.

Oxalic acid is found throughout nature, often in the form of oxalate in the cell membranes of plants such as barberry, sheepshead, wood sorrel and sorrel. Almost all plants contain calcium oxalate. Oxalic acid is a common component of plants, especially herbs, and it mostly exists in the form of potassium salt or calcium salt. Exists in the form of free acid in begonia and plantain

Reference: /baike.baidu.com/item/%E8%8D%89%E9%85%B8/728538?fr=aladdin#11" target="_blank"title="Baidu Encyclopedia-Oxalic Acid">Baidu Encyclopedia-Oxalic Acid