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Sodium potassium tartrate, also known as Rochelle salt, is a double salt of tartaric acid first prepared (in about 1675) by an apothecary, Élie Seignette [fr], of La Rochelle, France.
Sodium potassium tartrate and monopotassium phosphate were some of the early materials discovered to exhibit piezoelectricity.
This property led to Sodium potassium tartrate's extensive use in crystal phonograph cartridges, microphones and earpieces during the post-World War II consumer electronics boom of the mid-20th century.
CAS: 304-59-6
MF: C4H6O6.K.Na
MW: 212.18
EINECS: 206-156-8
Synonyms
POTASSIUM SODIUM TARTRATE SOLUTION 1.5M;SodiumPotassiumTartarate;Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, monopotassium monosodium salt;l-(+)-tartaric acid potassium sodium salt solution;[R-(R*,R*)]-2,3-Dihydroxybutanedioic acid monopotassium monosodium salt;Potassium sodium tartrate;Sodium potassium tartrate: (Potassium sodium tartrate);Alkaline potassium sodium tartrate, Potassium sodium tartrate solution alcaline
Such transducers had an exceptionally high output with typical pick-up cartridge outputs as much as 2 volts or more.
Rochelle salt is deliquescent so any transducers based on the material deteriorated if stored in damp conditions.
Sodium potassium tartrate has been used medicinally as a laxative.
Sodium potassium tartrate has also been used in the process of silvering mirrors.
Sodium potassium tartrate is an ingredient of Fehling's solution (reagent for reducing sugars).
Sodium potassium tartrate is used in electroplating, in electronics and piezoelectricity, and as a combustion accelerator in cigarette paper (similar to an oxidizer in pyrotechnics).
In organic synthesis, Sodium potassium tartrate is used in aqueous workups to break up emulsions, particularly for reactions in which an aluminium-based hydride reagent was used.
Sodium potassium tartrate is also important in the food industry.
The organic sodium and potassium salt of L-tartaric acid.
Sodium potassium tartrate is a common precipitant in protein crystallography and is also an ingredient in the Biuret reagent which is used to measure protein concentration.
Sodium potassium tartrate maintains cupric ions in solution at an alkaline pH.
Sodium potassium 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.
Sodium potassium tartrate and mono potassium phosphate were the first materials discovered to exhibit piezo electricity.
Sodium potassium tartrate is a colorless to blue - white salt crystallizing in the orthorhombic system.
Sodium potassium tartrate's molecular formula is KNaC4H4O6·4H2O.
Sodium potassium tartrate is slightly soluble in alcohol but more completely soluble in water.
Sodium potassium tartrate 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.
Sodium potassium tartrate has been used medicinally as a laxative.
Sodium potassium tartrate has also been used in the process of silvering mirrors.
Sodium potassium tartrate is an ingredient of Fehling's solution, formerly used in the determination of reducing sugars in solutions.
Sodium potassium tartrate, also known as Rochelle salt, is a double salt composed of potassium and sodium ions combined with the tartrate anion.
Sodium potassium tartrate is commonly represented by the formula KNaC4H4O6.
Sodium potassium tartrate typically appears as a white crystalline solid and is highly soluble in water, making it useful in various applications.
Sodium potassium tartrate exhibits a slightly sweet taste and is often utilized in food as a stabilizing agent for certain emulsions and in the production of cream of tartar.
In the laboratory, Sodium potassium tartrate serves as a reagent in analytical chemistry and is employed in the preparation of buffer solutions due to its ability to maintain pH levels.
Additionally, Sodium potassium tartrate has applications in the pharmaceutical industry and is sometimes used in the production of certain types of glass.
Sodium potassium tartrate is generally considered safe for consumption in moderate amounts, although excessive intake may lead to gastrointestinal discomfort.
Sodium potassium tartrate's unique properties make it valuable in both culinary and scientific contexts.
Sodium potassium 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 Rotation: [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
Cosmetics Ingredients Functions: BUFFERING
InChI: 1S/C4H6O6.K.Na/c5-1(3(7)8)2(6)4(9)10;;/h1-2,5-6H,(H,7,8)(H,9,10);;/q;2*+1/p-2/t1-,2-;;/m1../s1
InChIKey: LJCNRYVRMXRIQR-OLXYHTOASA-L
LogP: -1.080 (est)
CAS DataBase Reference: 304-59-6(CAS DataBase Reference)
EPA Substance Registry System: Sodium potassium tartrate (304-59-6)
Uses
Sodium potassium tartrate is a buffer and sequestrant that is the salt of i, (+)–tartaric acid. Sodium potassium tartrate has a solubility in water of 1 g in 1 ml.
Sodium potassium tartrate is also termed rochelle salt and potassium sodium tartrate.
Sodium potassium tartrate Solution is a chelator used for research purposes.
Preparation
Sodium potassium 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.
Sodium potassium tartrate 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 .
Preparation
Larger crystals of Rochelle salt have been grown under conditions of reduced gravity and convection on board Skylab.
Rochelle salt crystals will begin to dehydrate when the relative humidity drops to about 30% and will begin to dissolve at relative humidities above 84%.
