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

Chemistry

JAMB 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

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Correct Answer: Option D

Explanation

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

There is an explanation video available below.

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