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3.0 g of a sample of impure ammonium chl...

3.0 g of a sample of impure ammonium chloride were boiled with excess of caustic soda solution. Ammonia gas so evolved was passed into 120 mL of `N//2 H_(2)SO_(4)`. 28 mL of `N//2` NaOH were required to neutralise residual acid. Calculate the percentage of purity of the given sample of ammonium chloride.

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The correct Answer is:
0.82
`(120-28) mL N//2 H_(2)SO_(4)-=92 mL N//2 NH_(4)Cl`
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