Potassium Sodium Tartrate, 4-Hydrate, Crystal, Lab Grade

ASSAY: 95+%

SYNONYMS: Rochelle Salt, Seignette Salt

CAS: 6381-59-5

LABORATORY GRADE: This is a chemical product of reasonable purity (usually >95% but may be as high as 99% pure) where official standards  for quality or impurity levels have not been promulgated. For GENERAL LABORATORY USE and also suitable for EXPERIMENTS AND DEMONSTRATIONS IN CHEMICAL EDUCATION.

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.

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 purgative but in more recent years its piezoelectric properties have been more important and it has found usage in phonograph pickups and other sensing devices. 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.

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 reagent which is used to measure protein concentration.

Potassium Sodium Tartrate, 4-Hydrate, Crystal, Reagent ACS

ASSAY: 99+%

SYNONYMS: Rochelle Salt, Seignette Salt

CAS: 6381-59-5

This product meets or exceeds the Specifications prepared by the Committee on Analytical Reagents of the American Chemical Society (ACS). It is suitable for use in PRECISE LABORATORY ANALYTICAL WORK OF A GENERAL NATURE.

Potassium Sodium Tartrate, 4-Hydrate, Crystal, USP GRADE

Meets Requirements of the United States Pharmacopeia (The United States Pharmacopeia is the official public standards-setting authority for all prescription and over-the-counter medicines, dietary supplements, and other healthcare products manufactured and sold in the USA.  These standards are also recognized and used in many other countries.)

SYNONYMS: Rochelle Salt, Seignette Salt

CAS: 6381-59-5