Oxalic acid dihydrate
SIAL/33506 - puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.5% (manganometric)
Synonym: Ethanedioic acid dihydrate
CAS Number: 6153-56-6
Empirical Formula (Hill Notation): C2H2O4 · 2H2O
Molecular Weight: 126.07
EC Number: 205-634-3
MDL Number: MFCD00149102
Linear Formula: HO2CCO2H · 2H2O
Product Type: Chemical
| agency | reag. ISO |
| reag. Ph. Eur. | |
| USP/NF | |
| anion traces | chloride (Cl-): ≤5 mg/kg |
| sulfate (SO42-): ≤20 mg/kg | |
| assay | ≥99.5% (manganometric) |
| cation traces | Ca: ≤5 mg/kg |
| Cd: ≤5 mg/kg | |
| Co: ≤5 mg/kg | |
| Cu: ≤5 mg/kg | |
| Fe: ≤2 mg/kg | |
| heavy metals: ≤5 ppm (by ICP-OES) | |
| Ni: ≤5 mg/kg | |
| Pb: ≤5 mg/kg | |
| Zn: ≤5 mg/kg | |
| form | crystals |
| grade | ACS reagent |
| puriss. p.a. | |
| ign. residue | ≤0.01% (as SO4) |
| impurities | foreign organic matter, in accordance |
| ≤0.001% total nitrogen (N) | |
| InChI | 1S/C2H2O4.2H2O/c3-1(4)2(5 |
| InChI key | GEVPUGOOGXGPIO-UHFFFAOYSA |
| mp | 104-106 °C (lit.) |
| Quality Level | 200  |
| SMILES string | [H]O[H].[H]O[H].OC(=O)C(O |
| vapor density | 4.4 (vs air) |
| vapor pressure | <0.01 mmHg ( 20 °C) |
| Application: | Oxalic acid dihydrate has been used to prepare oxalate precursor, which was employed for the synthesis of zinc oxide nanopowders. It may be used to prepare the 0.01M solution of oxalic acid, which was employed in the mobile phase in liquid chromatographic studies. |
| General description: | Oxalic acid dihydrate crystals are monoclinic and exhibit a space group P21/n. Each unit cell contains two molecules. 13C chemical shielding tensors in oxalic acid dihydrate have been evaluated. |
| Symbol |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H302 + H312 - H318 |
| Precautionary statements | P264 - P270 - P280 - P301 + P312 - P302 + P352 + P312 - P305 + P351 + P338 |
| Hazard Codes | Xn |
| Risk Statements | 21/22-41 |
| Safety Statements | 26-36-37-39 |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 1 |
| Purity | ≥99.5% (manganometric) |
| mp | 104-106 °C (lit.) |
| UNSPSC | 12352100 |