Oxalic Acid is a chemical that is used in many industries for various purposes. In this guide, we will cover the basics of Oxalic Acid Chemical and its uses. We will also provide information on how to identify and handle this substance safely so you can use it without risking your health or the safety of others around you.

In this blog, we will discuss:

What is Oxalic Acid?

  • Oxalic acid is an organic compound that is also known as Ethanedioic acid. It is a colorless, transparent, and crystalline solid. It primarily exists in dihydrate (C2H2O4.2H20) form, and after decomposition, it exists in an anhydrous form.

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Oxalic acid

Oxalic Acid Uses

  • Due to its bleaching property, Oxalic acid becomes the best cleaning agent.
  • Oxalic acid is applied to lighten the color and soften the tone of wood and leather.
  • Oxalic acid is a gentle stain remover for stone, brick, linoleum, wood, and vinyl surfaces.
  • It is the best rust removal agent for metals.
  • It is the best polishing agent to give the original shine of marbles and stones.
  • Beekeepers use Oxalic acid as a miticide against parasitic Varroa mites.
  • Oxalic acid is used as the aluminum anodizing process with or without sulfuric acid.

Chemical and Physical properties of Oxalic Acid

Physical Properties of Oxalic acid


Ethanedoic acid

Chemical Formula


Molar Mass

90.034 g/mol (anhydrous)

126.065 g/mol (dihydrate)




White crystalline solid


1.90 g/cm3 at 170C (Anhydrous)

1.653 g/cm3 at 170C (dihydrate)


Vapor Pressure

<0.001 mmHg at 200 oC


Chemical Properties of Oxalic Acid

Melting Point

189 to 1910C (Anhydrous)

101.50C 9 (dihydrate)

Solubility in Water

75.5 g/L at 150OC

548 g/L at 650OC

Solubility in Ethanol

237 g/L at 150OC

Solubility in Diethyl Ether

14 g/L at 150OC

Acidity (pKa)

1.25, 4.14

Conjugate Base


Handling and Proper Storage of Oxalic Acid

  • Oxalic acid reacts violently with oxidizing agents like perchlorates, peroxides, permanganates, chlorates, nitrates, chlorine, bromine, and fluorine to cause fire and explosions.
  • Oxalic acid is stored in tightly closed containers. The storage area must be a cool, ventilated place, and it must be away from moisture and combustibles.
  • All sources of ignitions, like smoking, open flames, are prohibited where Oxalic acid is stored.
  • Oxalic acid must be handled by good industrial hygiene and safety practices.
  • Workers should remove and wash contaminated clothing after handling it. They should wash their faces, hands, and exposed skin thoroughly after handling.
  • Storage houses should have suitable facilities for quick drenching or flushing of eyes and bodies in contact with Oxalic acid.
  • Storage temperatures should be maintained between 0oC to 50o

Oxalic Acid Bee Treatment with Camachem Product

Oxalic Acid Typically used by Beekeepers for Miticide

Environmental Impacts of Oxalic Acid

  • Oxalic acid is found naturally in the environment. It has low persistence and no potential for accumulation in the food chain.
  • It degrades both in aerobic and anaerobic conditions. It will not volatilize at room temperature and concentrate on aquatic organisms.
  • Oxalic acid readily breaks down in surface water and soil surfaces. It is a naturally occurring component of honey.

How to Dispose of Oxalic Acid

  • Diluting Oxalic acid: Pour the Oxalic acid into a large container of ice water. It eliminates the risk of boiling and splashing. Remember to pour acid into water and not the other way around.
  • Neutralizing Oxalic acid: Pour baking soda into the dilute Oxalic acid solution. It will start bubbling. Continue adding baking soda until the bubbling stops.
  • Testing the pH: The best procedure is to add the baking soda until the solution reaches a pH of 7. But a pH of 5.5 is also safe to pour down the drain.
  • Pouring down the drain: At this point, the solution is neutralized, and it doesn't pose a toxicity hazard. Before pouring down the drain, add an excess amount of water into it. Around 100 grams or 100 mL is suitable for flushing down the drain.

Exporting Oxalic Acid and Regulations

  • While exporting Oxalic acid, you must have export data of Oxalic acid, a list of worldwide buyers and importers of Oxalic acid, the procedure to export Oxalic acid, duties, and taxes applicable to exporting Oxalic acid from China.
  • Anti-dumping duties are required when exporting oxalic acid to EU countries.
  • Camachem has a strong collaboration among reputable international testing agencies like SGS, Bureau Veritas, Intertek, CCIC, etc. We arrange these third-party testing agencies to visit the plant, review production, test products, conduct testing in their labs, issue reports, and seal containers before exporting Oxalic acid to your country.
  • Camachem is associated with international agencies authorized to conduct certificates of conformity (COC) and pre-export verification document (PVOC). We arrange COC/PVOC in compliance with your country's regulations before exporting Oxalic acid to your country.
  • Camachem exports Oxalic acid globally to nearly 101 countries. Major countries are Bangladesh, Belgium, Canada, Egypt, Ethiopia, Ghana, Italy, Ireland, Jordan, Kenya, Malaysia, Nepal, Nigeria, Pakistan, Poland, Romania, Spain, South Africa, Sri Lanka, Tanzania, Thailand, Turkey, Uganda, United States (US), United Kingdom (UK), Zambia, and Zimbabwe.
  • China exports 69% of the total Oxalic acid exported, which comes to $94 million.
  • Oxalic acid can be exported from the Chinese ports, viz. Ningbo, Shanghai, Dalian, Tianjin, Qingdao, Guangzhou, Suzhou, Shenzhen, Yingkou, Xiamen, Fuzhou, Taicang, Dongguan, Yantai, Nanjing, and Lianyungang.

Oxalic Acid Packaging and Shipping

Oxalic Acid Packaging

Transportation of Oxalic Acid

  • Oxalic acid containers are insured by top global insurance agencies under the terms of CIF.
  • Oxalic acid is shipped in 25 kg woven bags and 100 kg woven jumbo bags in a 20 ft container.

Oxalic Acid Price

  • We have a large stock of Oxalic acid 99%. At Camachem, you will get the cheapest rate of Oxalic acid 99%, at $650 per tonne.

Where to Buy Oxalic Acid

Are you looking to buy Oxalic Acid online? Please, contact us for a FREE quote on high-quality industrial chemicals and reagents. We also provide a large selection of mining chemicals, water chemicals, and specialty chemicals. You can purchase Oxalic acid 99% from Camachem.

Please contact us ([email protected]) or send a message on WhatsApp for a fast response: +86-131-2037-9271

FAQs on Oxalic Acid

What is Oxalic Acid Used for?

  • Oxalic acid is used as a cleaning agent, bleaching agent, stain removal agent, rust removal agent, and a superb polishing agent.

Is Oxalic Acid Harmful to Humans?

  • Oxalic acid is harmful to humans. It can cause severe burns to the eyes, skin, and mucous membranes. Ingestion of 5 grams of oxalic acid can cause death with symptoms of nausea, shock, collapse, and convulsions. Prolonged skin contact can cause skin rashes, redness, blisters, and slow-healing ulcers.

How is Oxalic Acid made?

  • Oxalic acid is prepared in the laboratory by oxidizing sucrose with Nitric acid. A small amount of Vanadium pentoxide is used as a catalyst.

What is the Formula for Oxalic Acid?

  • The formula of Oxalic acid is C2H2O4.

What does Oxalic Acid look like?

  • Oxalic acid looks like white crystals.

How much does Oxalic Acid cost?

  • At Camachem, one-tonne of Oxalic acid 99% costs $650.

What are the hazards of Oxalic Acid?

Oxalic Acid can cause severe health hazards upon inhalation, skin exposure, eye contact, and ingestion.

  • Inhalation: Cough, sore throat, burning sensation, shortness of breath, and headache.
  • Skin: Rashes, pain, redness, skin burns.
  • Eyes: Redness, pain, burns, blurred vision.
  • Ingestion: Sore throat, burning sensation, abdominal pain, labored breathing, convulsions, paralysis, cardiac dysrhythmia, and collapse shock.

Safety Shower Unit to Rinse Oxalic Acid Contamination

Safety Shower Unit to Rinse Oxalic Acid from the Body

How to Neutralize Oxalic Acid?

If contact with the body occurs, Oxalic acid can be neutralized in several ways:

  • Inhalation: Giving fresh air, resting, half-upright position. Refer for medical attention right away.
  • Skin: Immediately remove the contaminated clothes. Rinse the skin thoroughly with warm water or take a 15-minute shower. Refer to medical attention right away.
  • Eyes: Rinse with plenty of water. Refer to medical attention right away.
  • Ingestion: Rinse your mouth with plenty of water. Do not induce vomiting. Refer to a doctor right away for better medical care.

Is Oxalic Acid Soluble?

  • It is soluble in water, ethanol, and slightly soluble in diethyl ether. However, it is insoluble in other organic solvents.
  • Water Solubility: 75.5 g/L at 150C
  • Ethanol Solubility: 237 g/L at 150C
  • Solubility in diethyl ether: 14g/L at 150C

What is the pH of Oxalic Acid?

  • The pH range of Oxalic acid varies due to its polyprotic acid nature. The lowest pH is recorded as 1.25, and the highest pH is recorded as 4.14.

What is the Difference between Anhydrous Oxalic Acid and Dihydrate Oxalic Acid?

  • Oxalic acid primarily exists in dihydrate form (C2H2O4.2H20). When you heat it at 157oC, it sublimes to form an anhydrous state where two water molecules vaporize.

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Which Grade of Oxalic Acid Is Needed for Which Industry?

  • Oxalic acid is categorized into three distinct grades: dihydrate, anhydrous, and solution.
  • The dihydrate grade of oxalic acid accounts for 45% of market revenue.
  • The purity of dihydrate ranges from 99.5% to 100%, and it is widely used in laboratories, the pharmaceutical industry, and rare earth sampling.
  • Textiles, leather, agriculture, and the baking industry use mostly anhydrous and solution-grade oxalic acid.

How to Dissolve Oxalic Acid in Water?

  • 500 grams of Oxalic acid is dissolved in 1 L of boiling distilled water. It is stirred by bubbling air for 15 minutes.
  • To adjust the pH to 6-7, 400 grams of NaOH is added. Eventually, it results in a white oxalate precipitate.
  • The sample is stirred again for 30 minutes and left to stand for 4 to 5 hours to settle as a precipitate.
  • The supernatant sample is discarded, and the oxalate precipitate is collected for determining rare metals.

Does Oxalic Acid Work as a Burn Treatment?

  • No, it doesn't work as a burn treatment.

Proper Disposal of Oxalic Acid

  • Oxalic acid is disposed of by OSHA Hazardous Waste Operations and Emergency Response Standard protocols (29 CFR 1910.120).
  • If Oxalic acid is spilled, consider the following steps:
  • Evacuate every person on the premises and control the entrance area.
  • Extinguish all ignition sources.
  • First, moisten the spilled material and then use a HEPA-filter vacuum for clean-up. Later, place it into a sealed container for disposal.
  • After clean-up is completed, ventilate, and wash every corner of the area.
  • For disposal of hazardous waste, contact your state Department of Environmental Protection (DEP) or your regional office of the Federal Environmental Protection Agency (EPA).

Now you know more about Oxalic acid, including what it used for, how to handle it, and what exporters such as Camachem do when exporting this chemical.  If you want to purchase Oxalic acid, we have Oxalic acid 99% at the cheapest rate. Please contact us ([email protected]) or send a message on WhatsApp for a fast response +86-131-2037-9271.