Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Information
Name: Oxalic acid dihydrate
Alias: Ethanedioic acid dihydrate
CAS No.: 6153-56-6
Molecular Formula: C2H2O4·H2O1
Molecular Weight: 126.07
2. Physical and Chemical Properties
Physical Properties
- Appearance: Colorless transparent monoclinic crystal or white crystalline powder
- Odor: Odorless, mild sour taste
- Solubility: Soluble in hot water, moderately soluble in cold water; soluble in ethanol; insoluble in chloroform, benzene, petroleum ether
- Melting Point: Loses crystal water at 101–102 °C; anhydrous oxalic acid sublimes at 150 °C
- Hygroscopicity: Slightly efflorescent in dry air, non-hygroscopic under normal humidity
- Crystal characteristic: Easy to recrystallize from aqueous solution to form neat flaky crystals
Chemical Properties
- Molecular Structure: Dicarboxylic acid with two carboxyl groups, combined with one crystal water molecule
- Strong acidity: Stronger acid than acetic acid, capable of neutralizing alkalis to form oxalate salts
- Chelating property: Strong complexing ability with metal ions such as Ca1, Fe3+, Mn2+, forms insoluble calcium oxalate precipitate
- Reducing property: Easily oxidized by oxidants like potassium permanganate, commonly used for redox titration
- Thermal stability: Dehydrates at around 100 °C; decomposes above 160 °C into carbon monoxide, carbon dioxide and formic acid
- Photostability: Stable under indoor light; long-term strong sunlight slowly decomposes aqueous solution
- Compatibility: Compatible with neutral water-soluble auxiliaries; incompatible with calcium-containing substances, strong oxidants, heavy metal salts
3. Main Application Fields
1. Industrial Cleaning & Metal Treatment (Core Application)
- Metal rust remover, descaling agent for stainless steel, equipment pipelines and boiler scale
- Textile bleaching auxiliary, leather tanning decontamination agent
2. Chemical Laboratory Reagent
- Standard titration reagent for permanganate redox volumetric analysis
- Precipitation reagent for separation and detection of calcium, rare earth metal ions
3. Fine Chemical Raw Material
Synthetic intermediate for oxalate salts, dye intermediates, pharmaceutical raw materials
4. Daily & Agricultural Auxiliaries
- Household descaling agent for toilets, kettles and water heaters
- Trace element precipitant in agricultural soil testing
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 6153-56-6 |
| Molecular Formula | C2H2O4·H2O1 |
| Appearance | White crystalline powder |
| Assay | Industrial Grade ≥99.0%; Reagent Grade ≥99.5% |
| Loss on Drying (crystal water) | 14.0% ~ 15.5% |
| Residue on Ignition | ≤0.01% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 25kg PE lined woven bag / fiber drum |
| Storage Condition | Hermetic cool dry warehouse below 25 °C; isolated from calcium-containing raw materials and oxidants |
| Transportation Requirement | Non-dangerous goods, dust-proof sealed packaging |
| Shelf Life | 36 months under intact sealed packaging |
Safety Warning
Toxic organic acid. Dust severely irritates eyes, skin and respiratory tract; ingestion causes calcium oxalate precipitation in kidneys leading to renal damage. Wear dust mask, acid-resistant gloves and safety goggles during all operations. Avoid contact with calcium-containing materials to form insoluble precipitates. Waste liquid needs alkaline neutralization treatment before discharge; residues belong to organic hazardous waste requiring professional disposal.
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