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  4. What volume at NTP of ammonia gas will be required to be passed into 30 mL of NH2SO4 to bring down the acid normality to 0.2 N?

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Q. What volume at $NTP$ of ammonia gas will be required to be passed into $30 \,mL$ of $NH_2SO_4$ to bring down the acid normality to $0.2 \,N$?

Some Basic Concepts of Chemistry

Solution:

Meq. of $H_2SO_4$ (original) $= 30 \times 1 = 30$
Meq. of $H_2SO_4$ after passing $NH_3 = 30 \times 0.2 = 6$
Meq. of $H_2SO_4$ reacted = Meq. of $NH_3$
$= 30 - 6 = 24$
$\therefore \frac{\,{}^wNH_3}{17} \times 1000 = 24, \,{}^wNH_3 = 0.408\,g$
$\therefore V_{NH_3} $ at $STP = \frac{0.408}{17} \times 22.4 = 0.5376\,L$
$ = 537.6\,mL$