Seignette Salt definition of Seignette Salt in the Free Online Encyclopedia.

Seignette salt: see Rochelle salt Rochelle salt, colorless to blue-white orthorhombic crystalline salt with a saline, cooling taste. It is also called Seignette salt after Pierre Seignette, an apothecary of La Rochelle, France, who was the first to make it (c.1675).
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Seignette salt [sen′yet ‚sȯlt]

(inorganic chemistry)

potassium sodium tartrate

Seignette Salt

(also Rochelle salt, potassium sodium tartrate), a binary salt of the tartaric acid KOOC-(CHOH)₂COONa 4H₂O. It is named after the French apothecary P. Seignette (1632–98), who discovered the salt in 1655.

The salt’s colorless crystals decompose at 55.6°C and are freely soluble in water (1,390 grams per liter at 30°C). The name for a class of substances with unique dielectric properties, first discovered (Valasek, 1920) in this salt, is derived from the term “Seignette salt.” Seignette salt is contained in Fehling’s reagent (reactive with aldehydes and ketones) and is used as a laxative.

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