Seignettes Salt
| Product Name | Seignettes Salt |
|---|---|
| SKU | Seignettes Salt |
| EC no | 206–156–8 |
| CAS no | 304–59–6 |
| Formula | KNaC4H4O6.4H2O |
| Synonyms | Potassium Sodium Tartrate; E337; Seignette’s salt; Rochelle salt; Potassium sodium tartrate tetrahydrate; Potassium sodium 2,3-dihydroxysuccinate; L(+)-Tartaric acid potassium Sodium salt; butanedioic acid, 2,3-dihydroxy-, potassium sodium salt |
Seignette's Salt, also known as potassium sodium tartrate, is a double salt consisting of potassium and sodium combined with tartrate ions. It is a crystalline solid that is colorless to white and has a mildly salty taste. Chemically, it has the formula KNaC4H4O6·4H2O.
It is also called Rochelle salt, a name derived from the town of Rochelle in France, where the salt was isolated and used in the 1700s.
How is it formed?
Seignette's salt is formed as a byproduct in the wine industry, where potassium bitartrate (also known as "cream of tartar") from wine production combines with sodium carbonate (soda). The reaction that creates Seignette's salt can be summarized as:
Potassium bitartrate + Sodium carbonate → Potassium sodium tartrate + Carbon dioxide + Water
Potassium bitartrate, which forms naturally during the fermentation of wine, can be treated with sodium carbonate, leading to the formation of Seignette's salt.
Properties and Uses
- Appearance and taste: Seignette's salt is a white to colorless crystalline substance with a mild salty taste. It has no strong odor.
- Solubility: It is soluble in water but insoluble in alcohols, which differentiates it from many other salts.
- Historical uses: In ancient times, Seignette's salt was used in medicine, particularly as a laxative. It was also used in electrolytic cells and in chemical experiments, as it can induce electrolytic reactions.
- Contemporary uses: Today, Seignette's salt is not widely used in medicine, but it can still be used in some industrial processes, such as in the production of certain chemicals and optical devices.
Summary
Seignette's salt is a double salt made of potassium, sodium, and tartrate, and it is a byproduct of wine production. While it is less commonly used today, it has historical significance in both medicine and industry.
Seignette's salt is available in bulk and sacks.
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