Introduction
Ammonium oxalate, also known as diammonium oxalate, is a white crystalline salt primarily used as an analytical reagent and complexing agent in laboratory and industrial processes. With the chemical formula (NH₄)₂C₂O₄·H₂O, it exists as a monohydrate in most applications. It is well known for its ability to precipitate metal ions such as calcium, lanthanum, and others, forming stable oxalates.

Chemical Properties

• Chemical Name: Ammonium Oxalate Monohydrate

• CAS Number: 6009-70-7

• Molecular Formula: (NH₄)₂C₂O₄·H₂O

• Molecular Weight: 142.11 g/mol

• EC Number: 214-185-2

• Appearance: White crystalline powder

• Solubility: Soluble in water, insoluble in alcohol

• Odor: Odorless

• pH (5% solution): 6.0 – 8.0

Production Method
Ammonium oxalate is produced via a neutralization reaction between oxalic acid and aqueous ammonia:

Reaction:
H₂C₂O₄ (oxalic acid) + 2NH₃·H₂O → (NH₄)₂C₂O₄·H₂O

The process involves carefully controlling the stoichiometric ratio, followed by crystallization of the product from solution. The resulting monohydrate crystals are filtered, dried, and screened to meet high purity standards. This method ensures low impurity levels such as chloride, sulfate, and heavy metals.

Working Principle
Ammonium oxalate functions as a chelating and precipitating agent. It binds to metal ions through oxalate ligands, forming insoluble metal oxalates, which precipitate out of solution. This mechanism is crucial in analytical chemistry for quantifying metal concentrations, particularly calcium, magnesium, and rare earth metals.

Applications

1. Analytical Chemistry

• Used to determine calcium and magnesium by forming insoluble calcium oxalate.

• Serves as a standard in volumetric analysis and titration procedures.

2. Electroplating and Surface Treatment

• Acts as a complexing agent for metal ions, enhancing surface smoothness in electroplated coatings.

• Stabilizes metal ion concentration in plating baths.

3. Pharmaceuticals

• Used as an intermediate in synthesizing certain APIs (active pharmaceutical ingredients).

• Occasionally used in formulation and buffering systems.

4. Photographic Industry

• Plays a role in old-style photographic developers and film processing chemicals.

5. Research and Laboratory Use

• Widely used in inorganic chemistry labs and educational demonstrations.

• Applied in crystallography and coordination compound research.

6. Rare Earth Separation

• Helps precipitate rare earth oxalates during the refining and purification process.

Packaging and Handling

• Standard Packaging: 25 kg fiber drum or kraft paper bag with PE liner

• Custom Options: Available in smaller or bulk industrial quantities

• Storage: Keep in a dry, well-ventilated area away from moisture and strong oxidizing agents

• Shelf Life: 24 months in proper storage conditions

Why Choose Us – Jiangsu Khonor Chemicals Co., Limited

• 10+ years of export experience in oxalate and specialty chemicals

• Advanced production and quality control system ensuring ≥99% purity

• Full documentation available: COA, TDS, MSDS, ISO certificates

• OEM packaging, free sample support, and third-party lab testing

• Serving clients in Europe, South America, Southeast Asia, and the Middle East

TDS - Ammonium Oxalate.pdf

COA - reagent - Ammonium Oxalate - 250304A.pdf