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How is nitrogen prepared from ammonia ?...

How is nitrogen prepared from ammonia ?

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`NH_(3)` is first treated with dil. HCl and the ammonium chlorids thus formed is treated with an aqueous solution of sodium nitrite when `N_(2)` gas is evolved.
`NH_(3)(g)+HCl(aq)toNH_(4)Cl(aq)`
`NH_(4)Cl(g)+NaNO_(2)(aq)toNH_(4)NO_(2)(aq)+NaCl(aq)`
`NH_(4)NO_(2)(aq)overset(Delta)toN_(2)(g)+2H_(2)O(l)`
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