Potassium phosphate monobasic (KH₂PO₄) is a high-purity inorganic salt reagent used in analytical chemistry and buffer preparation. This compound dissolves readily in water and supports consistent performance in quality control and research protocols.
Potassium phosphate monobasic, catalogue No. 104873, is an inorganic salt reagent supplied by Sigma-Aldrich / Merck under the EMSURE® ISO product line. The chemical formula is KH2PO4. This compound is provided as a solid crystalline powder with an assay of ≥99.5% on a dry basis (alkalimetric) and is intended for analytical laboratory applications, buffer preparation and electrolyte solutions where a well-defined reagent is required.
Advantages
- High assay (≥99.5% on dry basis) suitable for analytical applications.
- EMSURE® ISO quality provides compliance with ISO standards.
- Solid crystalline form allows accurate weighing and dissolution.
- Useful reagent for buffer systems and electrolyte formulations.
- Dissolves readily in water for flexible solution preparation.
Technical specifications
| Product name | Potassium phosphate monobasic |
| Catalogue number | 104873 |
| Brand | Sigma-Aldrich / Merck |
| Chemical formula | KH2PO4 |
| CAS number | 7778-77-0 |
| Molecular weight | 136.09 g/mol |
| Assay | ≥99.5% (dry basis, alkalimetric) |
| Grade | Reagent grade, EMSURE® ISO |
| Form | Solid crystalline powder |
| Solubility | 208 g/L in water |
| pH of aqueous solution | 4.2–4.6 (20 °C) |
| Density | 2.338 g/mL at 25 °C |
| Bulk density | ~1200 kg/m³ |
| Storage conditions | 2–30 °C |
| Brand | Merck |
