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Nitric Acid

Explain the f...

Question

Explain the following: An all glass apparatus is used in the laboratory preparation of nitric acid.

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Solution

The apparatus used for the laboratory preparation of nitric acid are made of glass completely because the vapours of nitric acid are highly corrosive. They attack rubber cork, plastics etc.

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Q. Explain the following :
i)

D i l . H N O_{3}

is generally considered a typical acid but not so in the reaction with metals.
ii) Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
iii) In the laboratory preparation of nitric acid an all-glass apparatus is used.

Q. The apparatus used in the laboratory preparation of Nitric acid is made of :

Explain why

(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.

(b) Nitric acid is kept in a reagent bottle for a long time.

Q. Explain why [4 MARKS]
(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(b) Nitric acid, when kept in a reagent bottle for a long time, turns yellow.

Q. (i) What is special feature of the apparatus that is used in the laboratory preparation of nitric acid?
(ii) Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above 200°C?

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