Potassium sodium tartrate Chemical Properties

Melting point:

70~80℃

Boiling point:

100 °C

Density 

1.24

vapor pressure 

0Pa at 25℃

storage temp. 

Room Temperature

solubility 

Methanol, Water

form 

Liquid

color 

Clear Colorless

PH

7.0-8.5 (25℃, 1.5M in H2O)

optical activity

[α]20/D +22±1°, c = 1% in H2O

Water Solubility 

g anhydrous/100 g H2O: 31.9 (0°C), 67.8 (20°C), 102 (30°C) [LAN05]; slightly soluble alcohol [MER06]

λmax

λ: 260 nm Amax: 0.03
λ: 280 nm Amax: 0.025

LogP

-1.080 (est)

CAS DataBase Reference

304-59-6(CAS DataBase Reference)

EPA Substance Registry System

Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, monopotassium monosodium salt (304-59-6)

Safety Information

Hazard Codes 

Risk Statements 

Safety Statements 

WGK Germany 

WGK 3

Hazardous Substances Data

304-59-6(Hazardous Substances Data)

MSDS

• Language:English Provider:Potassium sodium tartrate
• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS

Potassium sodium tartrate Usage And Synthesis

Description

Potassium sodium tartrate is a double salt first prepared (in about 1675) by an apothecary, Pierre Seignette, of La Rochelle, France. As a result the salt was known as Seignette's salt or Rochelle salt. Rochelle salt is not to be confused with rock salt, which is simply the mineral form of sodium chloride. Potassium sodium tartrate and mono potassium phosphate were the first materials discovered to exhibit piezo electricity.
It is a colorless to blue - white salt crystallizing in the orthorhombic system. Its molecular formula is KNaC₄H₄O₆·4H₂O. It is slightly soluble in alcohol but more completely soluble in water. It has a specific gravity of about 1.79, a melting point of approximately 75°C, and has a saline, cooling taste. As a food additive, its E number is E337.
It has been used medicinally as a laxative. It has also been used in the process of silvering mirrors. It is an ingredient of Fehling's solution, formerly used in the determination of reducing sugars in solutions.

Chemical Properties

often supplied as a colourless aqueous solution

Uses

Laxative.

Uses

Sodium Potassium Tartrate is a buffer and sequestrant that is the salt of i, (+)–tartaric acid. It has a solubility in water of 1 g in 1 ml. It is also termed rochelle salt and potassium sodium tartrate.

Uses

Potassium Sodium Tartrate Solution is a chelator used for research purposes.

Preparation

Potassium sodium tartrate, (KNaC₄H₄O₆) may be prepared by adding 0.5 mole sodium carbonate to heated solution containing 1 mole potassium bitartrate(KHC₄H₅O₆). (1M KHC₄H₄O₆ : 0.5M Na₂CO₃). The solution is filtered while hot. This solution is then dried to precipitate solid potassium sodium tartrate, as small crystallites.
Larger crystals of Rochelle salt have been grown under conditions of reduced gravity and convection on board Skylab .

Definition

ChEBI: The organic sodium and potassium salt of L-tartaric acid (mol ratio 1:1:1).

Flammability and Explosibility

Not classified

Purification Methods

Recrystallise it from distilled water (1.5mL/g) by cooling to 0o. [Beilstein 3 IV 1223.]

Potassium sodium tartrate (304-59-6)Related Product Information

• Zolpidem tartrate
• Folic acid
• Potassium tartrate hemihydrate
• Potassium tartrate
• Ethyl 2-(Chlorosulfonyl)acetate
• Citric acid
• D(-)-Tartaric acid
• L(+)-Tartaric acid
• Potassium chloride
• Potassium Citrate
• Potassium iodate
• Potassium iodide
• Tylosin tartrate
• Potassium sorbate
• Potassium sodium tartrate tetrahydrate
• Ascoric Acid
• Sodium hexafluorophosphate
• IODOACETIC ACID SODIUM SALT