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Potassium sodium tartrate

Chemical compound
Potassium sodium tartrate tetrahydrate, also known as Rochelle salt, is a double salt of tartaric acid first prepared by an apothecary, Pierre Seignette, of La Rochelle, France. Potassium sodium tartrate and monopotassium phosphate were the first... Wikipedia
Formula: KNaC4H4O6·4H2O
Molar mass: 282.1 g/mol
Boiling point: 428°F (220°C)
Melting point: 167°F (75°C)
3D model (JSmol): Interactive image
Appearance: large colorless monoclinic needles
Crystal structure: orthorhombic

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