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

From On Laboratory Arts by Threlfall, Richard

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

From Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry by Priestley, Joseph

“Fehling’s solution” is prepared by dissolving separately 34.639 grammes of copper sulphate, 173 grammes of Rochelle salt, and 71 grammes of caustic soda in water, mixing and making up to 1000 ccs.;

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" by Various

It has physiological properties very similar to Rochelle salt.

From Human Foods and Their Nutritive Value by Snyder, Harry

Now, you know the shelf bottles of tartar emetic and Rochelle salt Ant. et Pot.

From Strictly business: more stories of the four million by Henry, O.