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rochelle's salt is sodium potassium tartarate. alkaline sodium potassium tartarate is Fehling's Solution B.
molecular formula: KNaC4H4O6·4H2O
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its sodium potassium tartrate tetrahydrate (KNaC4H4O6·4H2O)
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Rochelle salt (potassium sodium tartrate, NaKC4H4O6)
it is a double salt used in Seidlitz powder; acts as a cathartic !!!!!