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0.9546 g of a Rochelle salt , NaKC(4)H(4...

`0.9546` g of a Rochelle salt , `NaKC_(4)H_(4)O_(6).4H_(2)O` on ignition ,gave `NaKCO_(3)` , which was treated with `41.72` mL of `0.1307` N `H_(2)SO_(4)` . The unreacted `H_(2)SO_(4)` was then neutralised by `1.91` mL of `0.1297` N NaOH. Find the percentage purity of the Rochelle salt in the sample .

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`76.87` %
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