Citric Acid Trisodium Salt CAS 68-04-2
| CAS No. | 68-04-2 |
| Molecular Formula | C6H5O7 |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Citric Acid Trisodium Salt is closely related to a carbohydrate-derived structure in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Citric Acid Trisodium Salt (CAS 68-04-2), molecular formula C6H5O7Na and molecular weight 212.09 g/mol, is a CATO reference standard with documented purity and traceability.
Citric Acid Trisodium Salt (C6H5O7Na) contains a carbohydrate-derived structure. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C6H5O7 3*Na |
| Molecular Weight | 212.09 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
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- 8-Phenyl-[1,2,5]oxadiazolo[3,4-f]cinnoline (CAS 306935-63-7)
- (6-Methoxynaphthalen-2-yl)(phenyl)methanone (CAS 84255-35-6)
- Ziprasidone impurity 57 (CAS CATO-C4X-124057)
- Tirzepatide Impurity 13 (CAS CATO-C4X-324013)
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