Rochelle salt

American  

noun

Chemistry, Pharmacology.

1. 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.

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Rochelle salt British  

noun

1. a white crystalline double salt, sodium potassium tartrate, used in Seidlitz powder. Formula: KNaC 4 H 4 O 6 .4H 2 O

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Etymology

Origin of Rochelle salt

First recorded in 1745–55; after La Rochelle

Example Sentences

In using the baking powder prepared according to my formula, you have in your bread Glauber instead of Rochelle salts.

From Project Gutenberg

This acid, united to the mineral alkali, makes Rochelle salt.

From Project Gutenberg

Rochelle salts and seltzer aperient are given dissolved in water; the ordinary dose is from one to four teaspoonfuls.

From Project Gutenberg

Itching often disappears after a good saline cathartic has acted—Rochelle salts, solution of magnesia citrate, or phosphate of soda.

From Project Gutenberg

In another vessel dissolve pure Rochelle salt to the amount of 2.6 w, and make up the solution to the volume v.

From Project Gutenberg