Describe one method used in preparation of Nitrogen.

Describe one method used in preparation of Nitrogen.

Answers

(a). Isolation from air.
Procedure.
- Air is driven out of the aspirator by passing water into the aspirator from a tap.
- The air is the passed through a wash bottle containing concentrated potassium hydroxide solution.

Reason:
- To remove carbon (IV) oxide from air.

Equations:
2KOH_(aq) + CO_2(g) K₂CO_3(aq) + H₂O_(l)
Then
K₂CO_3(aq) + H₂O_(l) + CO_2(g) 2KHCO_3(aq)
Thus;
KOH_(aq) + CO_2(g) KHCO_3(aq)
- The carbon (IV) oxide-free air is then passed into a combustion tube with heated copper metal.

Reason:
- To remove oxygen from the air.

Note:
In this reaction the brown copper metal is oxidized to black copper (II) oxide.

Equation:
2Cu_(s) + O_2(g) 2CuO_(s)
Brown Black

Note:
- Alternatively oxygen can be removed by passing the carbon (IV) oxide-free air through pyrogallic acid.
- The remaining part of air is mainly nitrogen and is collected over water.

Note:
- Nitrogen obtained by this method contains noble gases like xenon, argon etc as impurities.
- Purer nitrogen may be obtained by heating ammonium nitrite.

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Kavungya answered the question on March 5, 2019 at 09:15

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