Rochelle salt
American Heritage Dictionary:
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Ro·chelle 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). Chemically, it is potassium sodium tartrate, KNa (C4H4O6)·4H2O. It is soluble in water and slightly soluble in alcohol, melts at about 75°C, has specific gravity 1.79, and exhibits double refraction. It is used in medicine as a mild purgative, often in the form of Seidlitz powders. It is an ingredient of Fehling's solution. It is used in silvering mirrors. Crystals of Rochelle salt are easily grown and are used in piezoelectric devices, e.g., crystal microphones and phonograph pickup cartridges (see piezoelectric effect).
Oxford Dictionary of Biochemistry:
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Rochelle salt
potassium sodium tartrate tetrahydrate; it is used as a constituent of Fehling's solution. [After La Rochelle, French port.]
| Robo, Robison ester, Robertsonian translocation | |
| Rohypnol, Rop, Rossmann fold |
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Columbia Encyclopedia
The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2012, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.
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Mentioned in
piezoelectric semiconductor
(solid-state physics)
crystal headphones
(engineering acoustics)
kallitype
(graphic arts)
Nylander reagent
(chemistry)
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