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noun, Chemistry.
noun, Chemistry, Pharmacology.
a colorless or white, water-soluble solid, KNaC 4 H 4 O 6 ⋅4H 2 O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative.
a white crystalline double salt, sodium potassium tartrate, used in Seidlitz powder. Formula: KNaC4H4O6.4H2O

potassium sodium tartrate n.
A colorless efflorescent crystalline compound used as a laxative. Also called Rochelle salt, Seignette’s salt.

Rochelle salt Ro·chelle salt (rə-shěl’, rō-)
See potassium sodium tartrate.


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  • Potation

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