The brown coloration in nitric acid prepared in the laboratory can be removed by?
heating the acid
bubbling air through the acid
cooling the acid
adding a decolorizing agent
adding a base
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The brown coloration in nitric acid prepared in the laboratory can be removed by **bubbling air through the acid**. The brown coloration in nitric acid is due to the presence of nitrogen dioxide (NO2), an impurity produced during the preparation of nitric acid. Nitrogen dioxide is a brown gas, which gives the nitric acid a brown coloration. When we bubble air through the nitric acid, the nitrogen dioxide dissolves in the air and is carried away, leaving behind clear, colorless nitric acid. So, the correct answer is **B**.
Heating the acid (Option A) can actually cause more nitrogen dioxide to be released, making the acid even browner. Cooling the acid (Option C) will not remove the nitrogen dioxide. Adding a decolorizing agent (Option D) or a base (Option E) could change the chemical properties of the nitric acid, which is not what we want. We simply want to remove the brown coloration without changing the nitric acid itself. Therefore, options A, C, D, and E are incorrect in this context.
why is the answer (B)bubbling the air through acid
and the my school AI is saying (c) cooling acid
it even said that (b) is wrong and it explained clearly why
