Sodium sulfate, anhydrous, catalogue No. 106649, is a high-purity inorganic salt reagent supplied by Sigma-Aldrich / Merck under the EMSURE® product line. The product is specified with an assay ≥99.0% (alkalimetric) and 98.5–101% on a dry basis (alkalimetric) and is compliant with ACS reagent quality as well as ISO and European Pharmacopoeia (Ph. Eur.) standards. Sodium sulfate is commonly used in analytical laboratory procedures, buffer and electrolyte preparation, and as a reagent in various classical analysis methods. The anhydrous form is provided as a solid crystalline powder that dissolves readily in water.
Advantages
- High assay (≥99.0% alkalimetric) suitable for analytical use.
- Meets ACS reagent, ISO and Ph. Eur. quality requirements.
- Solid crystalline form allows accurate weighing and dissolution.
- Highly soluble in water for flexible reagent preparation.
- Reliable reagent for buffer systems and electrolyte solutions.
Technical specifications
| Product name |
Sodium sulfate, anhydrous |
| Catalogue number |
106649 |
| Brand |
Sigma-Aldrich / Merck |
| Chemical name |
Sodium sulfate (Na2SO4) |
| CAS number |
7757-82-6 |
| Molecular weight |
142.04 g/mol |
| Assay |
≥99.0% (alkalimetric); 98.5–101% dry basis (alkalimetric) |
| Grade |
ACS reagent, ISO, Ph. Eur. |
| Form |
Solid crystalline powder |
| Solubility |
Soluble in water |
| pH of aqueous solution |
5.2–8.0 (20 °C, 50 g/L) |
| Melting point |
884 °C (literature) |
| Density |
2.68 g/mL (25 °C) |
| Bulk density |
1400–1600 kg/m3 |
| Storage conditions |
2–30 °C |
| Quality level |
300 |
Available packaging options
| Pack size |
| 500 g |
| 1 kg |
| 5 kg |
| 25 kg |
