| Identification | More | [Name]
Potassium sodium tartrate | [CAS]
304-59-6 | [Synonyms]
ALKALINE POTASSIUM SODIUM TARTRATE
ALKALINE TARTRATE
ALKALINE TARTRATE SOLUTION B
FEHLING B SOLUTION
FEHLING SOLUTION B
FEHLING-SOXHLET SOLUTION B (ALKALI)
FEHLING'S REAGENT II
FEHLING'S REAGENT II FOR SUGARS
FEHLING'S REAGENT SOLUTION(B)
FEHLINGS SOLUTION, ALKALINE B
FEHLING'S SOLUTION B
FEHLING'S SOLUTION NO 2
L-(+)-TARTARIC ACID POTASSIUM SODIUM SALT
POTASSIUM SODIUM TARTRATE
ROCHELLE SALT
ROCHELLE SALTS
SODIUM POTASSIUM TARTRATE
2,3-dihydroxy-[theta-(theta,theta)]-butanedioicacimonopotassiummonos
2,3-dihydroxy-butanedioicacimonopotassiummonosodiumsalt
Butanedioicacid,2,3-dihydroxy-(R-(R*,R*))-,monopotassiummonosodiumsalt | [EINECS(EC#)]
206-156-8 | [Molecular Formula]
C4H4KNaO6 | [MDL Number]
MFCD00065391 | [Molecular Weight]
210.16 | [MOL File]
304-59-6.mol |
| Chemical Properties | Back Directory | [Appearance]
often supplied as a colourless aqueous solution | [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) | [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. | [CAS DataBase Reference]
304-59-6(CAS DataBase Reference) | [EPA Substance Registry System]
304-59-6(EPA Substance) |
| Hazard Information | Back Directory | [Chemical Properties]
often supplied as a colourless aqueous solution | [Definition]
ChEBI: The organic sodium and potassium salt of L-tartaric acid (mol ratio 1:1:1). | [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. | [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 . | [Purification Methods]
Recrystallise it from distilled water (1.5mL/g) by cooling to 0o. [Beilstein 3 IV 1223.] | [Flammability and Explosibility]
Notclassified |
| Safety Data | Back Directory | [Hazard Codes ]
C | [Risk Statements ]
R35:Causes severe burns. | [Safety Statements ]
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S37/39:Wear suitable gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . | [WGK Germany ]
WGK 3 | [Hazardous Substances Data]
304-59-6(Hazardous Substances Data) |
|
|