Potassium Sodium Tartrate
Rochelle Salt, Sodium Potassium Tartrate
- CAS
- 6381-59-5
- EC
- 613-385-0
- Food Code
- E337
- Sectors
- Food & Nutrition, Pharma & Healthcare, Home Care & Industrial Cleaning
Potassium Sodium Tartrate (CAS 6381-59-5), also known as Rochelle salt, is a colorless crystalline double salt of potassium and sodium that appears as white semi-transparent crystals, is freely soluble in water and forms neutral solutions, and serves the food, pharmaceutical and electroplating industries as a buffering, emulsifying and sequestering agent.
Typical Properties
| Molecular formula | C4H6O6.4H2O.K.Na |
|---|---|
| Molecular weight | 282.22 g/mol |
| Appearance | white semi-transparent crystals |
| Form | Solid |
| Color | White semi-transparent |
| Odor | Odorless |
| Melting point | 70-80 °C |
| Boiling point | 220°C |
| Density | 1.77 g/cm³ |
| Water solubility | 630 g/L (20 °C) |
| pH | 7.0-8.5 (25°C, 50mg/mL in H2O) |
| HS code | 29181300 |
| Grades available | Food Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Potassium Sodium Tartrate
Applications
Used in electroplating, pharmaceuticals, and food industries as a buffering and emulsifying agent. In laboratories, it acts as a reagent in Fehling’s solution for sugar analysis and as a sequestering agent in metal finishing.
Safety & Risks
Non-toxic and stable under normal conditions; prolonged humidity exposure may cause clumping.
Packaging
Delivered in 25 kg paper bags or 50 kg fiber drums. Store in a cool, dry, and sealed environment protected from moisture.