Question on: JAMB Chemistry - 2017

In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by

A
further heating
B
adding concentrated H2SO4
C
cooling the acid solution with cold water
D
bubbling air through the acid solution
Ask EduPadi AI for a detailed answer
Correct Option: D

Bubbling of air through the acid solution removes deposited oxides of nitrogen.

Nitric acid is prepared in the laboratory by heating a nitrate salt with the concentrated acid.

NaNO3 + H2SO4 → NaHSO4 + HNO3

Vapours of nitric acid are condensed to a brown liquid in a receiver cooled under cold water. "Dissolved oxides of nitrogen" e.g NO2 are removed by redistillation or blowing a current of carbondioxide or dry air through the warm acid

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