On ignition, Rochelle salt (molar mass 282) is converted into (molar mass 122)
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Problem
On ignition, Rochelle salt NaKC4H4O6⋅4H2O (molar mass 282) is converted into NaKCO3 (molar mass 122). 0.9546 g sample of the Rochelle salt on ignition gives NaKCO3 which is titrated with 41.72 mL H2SO4 . From the following data, find the percentage purity of the Rochelle salt. The solution after neutralization requires 1.91 mL of 0.1297 N NaOH . The H2SO4 used for the neutralization requires its 10.27 mL against 10.35 mL of 0.1297 N NaOH .