How Can 68% Nitric Acid Be Concentrated to 98% Nitric Acid?

How can 68% nitric acid be concentrated to 98% nitric acid?

One Line Answer

98% nitric acid is obtained by distilling 68% nitric acid with conc. H₂SO₄ under reduced pressure. The function of H₂SO₄ is to absorb water.

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Laboratory Preparation of Nitric Acid

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Chapter 10: Study of Compounds: Nitric Acid - Exercises [Page 229]

Chapter 10 Study of Compounds: Nitric Acid
Exercises | Q 15. (b) | Page 229

How will you prepare the following from nitric acid?

Ferric nitrate

Name a metal nitrate which on heating is changed into metal.

Name the Following:
Two coloured nitrates.

Give reason for the following:
Nitric acid is used in purification of gold.

Complete and balance the following equation :
SO₂ + HNO₃ → ______________

Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?

Describe what you see when concentrated nitric acid is added to copper.

When nitric acid is prepared by the action of concentrated sulphuric acid on potassium nitrate. what is the special feature of the apparatus used?

Explain why only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.

Explain why nitric acid is kept in a reagent bottle for a long time.