7670. Potassium Sodium Tartrate

Nomenclature

CAS number: 304-59-6
(2R,3R)-2,3-Dihydroxybutanedioic acid potassium sodium salt (1:1:1); Rochelle salt; Seignette salt.
C4H4KNaO6; mol wt 210.16.
C 22.86%, H 1.92%, K 18.60%, Na 10.94%, O 45.68%.
KNaC4H4O6.

Derivative

Tetrahydrate.

Nomenclature

CAS number: 6381-59-5
C4H4KNaO6.4H2O; mol wt 282.22.
C 17.02%, H 4.29%, K 13.85%, Na 8.15%, O 56.69%.

Properties

Translucent crystals or white, cryst powder; cooling saline taste. Slightly effloresces in warm air. d 1.79; mp 70-80°; at 100° loses 3H2O; becomes anhydr at 130-140°; at 220° begins to dec. Sol in 0.9 part water. Almost insol in alcohol. The aq soln is slightly alkaline to litmus. pH 7-8. Incompat. Acids, calcium or lead salts, magnesium sulfate, silver nitrate.

Use

Manuf of mirrors; as a constituent of Fehling's soln. For the control of radio frequencies, and wherever piezoelectric crystals are used. In aqueous extractions as a chelator of metal ions, especially aluminum.

Therapeutic Category

Cathartic.

Keywords

Laxative/Cathartic