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20g of impure NACI smaple is added aqueo...

`20g` of impure `NACI` smaple is added aqueous solution having excess `AGNO_(3)AgCI` precipitate is filtered
[Atomic mass `Ag = 108, CI = 35.5]` .

Text Solution

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`{:(AgNO_(3)(aq)+,NaCl(aq) rarr,AgCl(s)+,NaNO_(3)(s),["Precipitation reaction"]),(0.2 "moles"," "(28.7)/(143.5)"moles",,,):}`
`= 0.2 "moles"`
Mass of `NaCl = 0.2 xx 58.5 = 11.7 gm`
`%` purity `= (11.7)/(20) xx 100`
`= 58.8 %`
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