Analytical-grade anhydrous citric acid meeting major pharmacopeia specifications, used as a reagent in laboratory workflows. Provided as a solid crystalline reagent, it is widely used in buffer preparation, analytical chemistry and general laboratory applications requiring a well-defined organic acid.
Citric acid, catalogue No. 27109, is a high-purity anhydrous organic acid reagent supplied by Sigma-Aldrich / Merck. The product meets analytical specifications of the European Pharmacopoeia (Ph. Eur.), British Pharmacopoeia (BP), U.S. Pharmacopeia (USP) and E330 standards, with an assay of 99.5–100.5% based on the anhydrous substance. Citric acid is a weak organic acid commonly used in buffer preparation, pH adjustment, analytical chemistry and general laboratory workflows requiring a defined organic acid reagent.
Advantages
- High analytical purity (99.5–100.5% based on anhydrous substance).
- Meets major pharmacopeia specifications: Ph. Eur., BP, USP and E330.
- Anhydrous form ensures consistent composition and solubility.
- Crystalline solid allows accurate weighing and solution preparation.
- Widely used reagent for buffer systems and analytical applications.
Technical specifications
| Product name | Citric acid, analytical grade, anhydrous |
| Catalogue number | 27109 |
| Brand | Sigma-Aldrich / Merck |
| Chemical name | Citric acid |
| CAS number | 77-92-9 |
| Molecular formula | C6H8O7 |
| Molecular weight | 192.12 g/mol |
| Assay | 99.5–100.5% (based on anhydrous substance) |
| Form | Crystalline solid (grit) |
| Quality specification | Meets Ph. Eur., BP, USP, E330 standards |
| Solubility | ~383 g/L in water (25 °C) |
| pKa values | 3.13, 4.76, 6.40 |
| Melting point | 153–159 °C |
| Storage conditions | 15–25 °C, dry |
| Brand | Merck |
