Potassium Sodium Tartrate
Title: Potassium Sodium Tartrate
CAS Registry Number: 304-59-6
Additional Names: Rochelle salt; Seignette salt
Molecular Formula: C4H4KNaO6
Molecular Weight: 210.16
Percent Composition: C 22.86%, H 1.92%, K 18.60%, Na 10.94%, O 45.68%
Line Formula: KNaC4H4O6
 
Derivative Type: Tetrahydrate
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.
Melting point: mp 70-80°
Density: d 1.79
 
Use: Manuf of mirrors; as a constituent of Fehling's soln. For the control of radio frequencies, and wherever piezoelectric crystals are used.
Therap-Cat: Cathartic.
Keywords: Laxative/Cathartic.

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