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Question
How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.
Solution
An aqueous solution of ammonium chloride is treated with sodium nitrite.
`NH_4Cl_(aq) + NaNO_(2(aq)) -> N_(2(g)) -> + 2H_2O_((i)) + NaCl_((aq))`
NO and HNO3 are produced in small amounts. These are impurities that can be removed on passing nitrogen gas through aqueous sulphuric acid, containing potassium dichromate.
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