Potassium sodium tartrate
From Sciencemadness Wiki
 Potassium sodium tartrate aka Rochelle salt
| |
| Names | |
|---|---|
| IUPAC name
Sodium potassium L(+)-tartrate tetrahydrate
| |
| Other names
E337
Rochelle salt Seignette salt | |
| Properties | |
| KNaC4H4O6·4H2O | |
| Molar mass | 282.1 g/mol |
| Appearance | Large colorless monoclinic needles |
| Odor | Odorless |
| Density | 1.79 g/cm3 |
| Melting point | 75 °C (167 °F; 348 K) |
| Boiling point | 220 °C (428 °F; 493 K) (decomposes) |
| 26 g/100 ml (0 °C) 47.4 g/100 ml (6 °C) 66 g/100 ml (26 °C) | |
| Solubility | Insoluble in acetone, ethanol |
| Vapor pressure | ~0 mmHg |
| Hazards | |
| Safety data sheet | Sigma-Aldrich (tetrahydrate) |
| Related compounds | |
| Related compounds
|
Tartaric acid Potassium antimony tartrate |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Potassium sodium tartrate (tetrahydrate), more commonly known as Rochelle Salt, is a double salt of tartaric acid first prepared (around 1675) by an apothecary, Pierre Seignette, of La Rochelle, France.
Contents
Properties
Chemical
Addition of a strong acid, like hydrochloric acid will give tartaric acid.
Physical
Potassium sodium tartrate is a white crystalline solid, soluble in water.
Uses
- Potassium Sodium Tartrate is used in the preparation of Biuret reagent.
- Potassium Sodium Tartrate is used in the the preparation of Fehling's Solution
- Potassium Sodium Tartrate is used in "crystal" microphones.
- Potassium Sodium Tartrate is used as an alkaline buffer.
- Potassium Sodium Tartrate has been used as a laxative.
Availability
Potassium sodium tartrate is readily available on EBay.
Preparation
Can be prepared from tartaric acid.
Projects
Handling
Safety
Can be irritating to skin.
Storage
Potassium sodium tartrate is very deliquescent and should be stored in a sealed container.
Disposal
Dissolve in large excess of water and put down drain.
