- Potassium sodium tartrate
Name = Potassium sodium tartrate
ImageFile = K-Na-L-(+)-tartrate.png
ImageSize = 200px
ImageName = Potassium sodium tartrate
IUPACName = Potassium sodium tartrate
OtherNames = E337
Section1 = Chembox Identifiers
CASNo = 304-59-6
EINECS = 206-156-8
Section2 = Chembox Properties
Formula = KNaC4H4O6·4H2O
MolarMass = 282.1 g/mol
MeltingPt = 75 °C
BoilingPt = 220 °C
Potassium sodium tartrate is a
double saltfirst 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.
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 gravityof about 1.79, a melting pointof approximately 75 °C, and has a saline, cooling taste. As a food additive, its E numberis E337.
It has been used medicinally as a
purgativebut in more recent years its piezoelectric properties have been more important and it has found usage in phonographpickups and other sensing devices. It has also been used in the process of silveringmirrors. It is an ingredient of Fehling's solution, formerly used in the determination of reducing sugars in solutions.
In organic synthesis, it is used in aqueous workups to break up emulsions, particularly for reactions in which an aluminum-based hydride reagent was used.
It is also an ingredient in the
Biuret reagentwhich is used to measure proteinconcentration.
Rochelle salt (potassium sodium tartrate, NaKC4H4O6) can easily be prepared from
potassium bitartrate(KHC4H4O6) and sodium carbonate(Na2CO3). First heat a potassium bitartrate solution. Add sodium carbonate to the still hot solution in a 1:0.5 (KHC4H4O6 : Na2CO3) mole ratio ( Effervescenceof carbon dioxide is observed). Filter the solution while hot and then heat to dryness. The precipitate is potassium sodium tartrate, which can be recrystallised.
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Look at other dictionaries:
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