1.0 2010-04-08 22:12:43 UTC 2025-11-19 01:50:51 UTC FDB016910 Sodium potassium tartrate It is used in food processing as an emulsifier and pH control agent 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.; 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.; 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 monopotassium phosphate were the first materials discovered to exhibit piezoelectricity. This property led to its extensive use in "crystal" gramophone (phono) pick-ups, microphones and earpieces during the post-War consumer electronics boom of the mid-20th Century. 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. E337 L(+)-tartaric acid potassium sodium salt Monopotassium monosodium tartrate Potassium sodium (R*,R*)-(1)-tartrate Potassium sodium l(+)-tartrate Potassium sodium tartrate Potassium sodium tartrate (anhydrous) Potassium sodium tartrate anhydrous Potassium sodium tartrate tetrahydrate Rochelle salt Seignette salt Sodium potassium (DL)-tartrate Sodium potassium l-tartrate Sodium potassium salt of l-(+)-tartaric acid Sodium potassium tartrate Tartaric acid, monopotassium monosodium salt C4H4KNaO6 210.159 209.954264396 potassium sodium 2,3-dihydroxybutanedioate potassium sodium tartrate 304-59-6 [Na+].[K+].OC(C(O)C([O-])=O)C([O-])=O 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 LJCNRYVRMXRIQR-UHFFFAOYSA-L belongs to the class of organic compounds known as beta hydroxy acids and derivatives. Beta hydroxy acids and derivatives are compounds containing a carboxylic acid substituted with a hydroxyl group on the C3 carbon atom. Beta hydroxy acids and derivatives Organic compounds Organic acids and derivatives Hydroxy acids and derivatives Beta hydroxy acids and derivatives Aliphatic acyclic compounds 1,2-diols Carbonyl compounds Carboxylic acid salts Carboxylic acids Dicarboxylic acids and derivatives Fatty acids and conjugates Hydrocarbon derivatives Monosaccharides Organic oxides Organic potassium salts Organic sodium salts Secondary alcohols Short-chain hydroxy acids and derivatives 1,2-diol Alcohol Aliphatic acyclic compound Beta-hydroxy acid Carbonyl group Carboxylic acid Carboxylic acid derivative Carboxylic acid salt Dicarboxylic acid or derivatives Fatty acid Hydrocarbon derivative Monosaccharide Organic alkali metal salt Organic oxide Organic oxygen compound Organic potassium salt Organic salt Organic sodium salt Organooxygen compound Secondary alcohol Short-chain hydroxy acid logp -1.90 ALOGPS logs 0.46 ALOGPS solubility 6.08e+02 g/l ALOGPS melting_point Mp 70-80° logp -1.8 ChemAxon pka_strongest_acidic 2.72 ChemAxon pka_strongest_basic -4.3 ChemAxon iupac potassium sodium 2,3-dihydroxybutanedioate ChemAxon average_mass 210.159 ChemAxon mono_mass 209.954264396 ChemAxon smiles [Na+].[K+].OC(C(O)C([O-])=O)C([O-])=O ChemAxon formula C4H4KNaO6 ChemAxon inchi 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 ChemAxon inchikey LJCNRYVRMXRIQR-UHFFFAOYSA-L ChemAxon polar_surface_area 120.72 ChemAxon refractivity 47.89 ChemAxon polarizability 10.82 ChemAxon rotatable_bond_count 3 ChemAxon acceptor_count 6 ChemAxon donor_count 2 ChemAxon physiological_charge -2 ChemAxon formal_charge 0 ChemAxon Specdb::MsMs 1231411 Specdb::MsMs 1231412 Specdb::MsMs 1231413 Specdb::MsMs 1346944 Specdb::MsMs 1346945 Specdb::MsMs 1346946