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. Events January 5 - The Battle of Turckeim June 18 - Battle of Fehrbellin August 10 - King Charles II of England places the foundation stone of the Royal Greenwich Observatory in London - construction begins November 11 - Guru Gobind Singh becomes the Tenth Guru of the Sikhs. ... Bowl of Hygeia Pharmacy (from the Greek φάρμακον = drug) is the profession charged with ensuring the safe use of medication. ... Location within France La Rochelle is a city or commune of western France, and a seaport on the Atlantic Ocean (population 76,584 in 1999). ...

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. Quartz crystal A crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. ... In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ...

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. A laxative is a preparation used for the purpose of encouraging defecation, or the elimination of feces. ... Piezoelectricity is the ability of certain crystals to generate a voltage in response to applied mechanical stress. ... Edison cylinder phonograph from about 1899 The phonograph, or gramophone, was the most common device for playing recorded sound from the 1870s through the 1980s. ... Silvering is the chemical process of coating glass with a reflective substance, originally silver, in order to create a mirror. ... Fehlings solution is a solution used to detect aldehyde functional groups. ... A reducing sugar is a type of sugar with a ketone or aldehyde group. ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture composed of one or more substances known as solutes that are dissolved in another substance known as a solvent. ...

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.